Naperville, Illinois
DuPage County publishes its whole parcel roll as a free public map layer, so the taxpayer name and assessed value of every one of Naperville's 32,898 DuPage parcels can be read without an account; the city's Will County side is not reachable, and Illinois sale prices sit in a state declaration system that scripts cannot use.
10 buildings · 10 with an owner established · 25 sources · 6 tier B · 4 tier A · prepared 2026-10-21
Can you find out who owns it?
Illinois has no title register: deeds are recorded with the county Recorder, and Naperville straddles two counties, DuPage (the north and centre) and Will (the south). DuPage's Recorder indexes documents free online from 1961 by name and from 1985 by parcel number; copies cost $0.50 a page. DuPage County's GIS division publishes the assessment parcels joined weekly to the real-estate file as a public ArcGIS layer: billing (taxpayer) name and address, property class, assessed land and building value, exemption code and taxing districts for every parcel. The billing name is the taxpayer, which is usually the owner but is sometimes a tax agent or lender. Sale prices are filed with the state on the PTAX-203 transfer declaration through the Department of Revenue's MyDec system; Illinois taxes each transfer at 50 cents per $500 of declared value and the City of Naperville adds $3 per $1,000; the Department of Revenue says recorded declarations can be searched in MyDec without an account, but the application would not open to a script. The Will County parcel server refused connections, and Will County's own property search is closed to crawlers in robots.txt.
Is ownership public?An open dataset names the owner
Cost of one title searchRecorder's index and document images free online (DuPage County Recorder, from 1961 by name, 1985 by PIN); copies $0.50 per page, certification $5 per document; recording a deed $86. Transfer tax: Illinois 50 cents per $500 of declared value (35 ILCS 200/31-10); City of Naperville $3.00 per $1,000 (DuPage Recorder's municipal stamp table); the county rate was not stated on any page opened
Bulk ownership dataDuPage County GIS 'ParcelsWithRealEstateCC' FeatureServer (337,048 county parcels, 32,898 coded Naperville: PIN, billing name and address, property class, assessed land/improvement/total value, exemption code, taxing districts), public, no registration, 1,000 records per request, real-estate file joined weekly; no licence stated, so rows are not republished. The Will County tax-map parcel service (gis.willcountyillinois.com) refused connections on 21 Oct 2026
Sale pricesEvery sale, with its address
1
The marquee buildings
The towers that set the tone of the core, and who holds them. A price is the price a document states, on the date it states — not an estimate of what the building is worth now.
| Building | Use | Owner | Owner type | Last price paid |
|---|---|---|---|---|
| Edward Hospital, main campus (Endeavor Health) 801 S Washington St, Naperville |
Institutional | Edward Health Services The parcel containing the hospital's published coordinates (s12) is 07-24-400-016 (23.34 acres), one of four parcels at 801 S Washington St billed to EDWARD HEALTH SERVICES, together 48.6 acres in the roll's ACREAGE field. One (07-24-400-013, 7.74 acres) is exempt; the other three carry $8,081,040 of assessed value ($3.31M land), about $24.2M at the statutory one-third level (s7). A seventh parcel, 10 W Martin Ave, is billed to EDWARD HOSPITAL ($5.5M assessed). The roll gives the taxpayer, not the deed holder. Wikipedia places the hospital in Endeavor Health (s12); no filing we opened states the link between that system and the billed entity. |
Institution | —B |
| North Central College campus 30 N Brainard St, Naperville |
Institutional | North Central College 64 parcels are billed to NORTH CENTRAL COLLEGE: 60 exempt (class E), most at the campus address 30 N Brainard St, and 4 taxable houses on Riverview Dr and Hillside Rd ($892,969 assessed). The ACREAGE field sums to 64.7 acres, close to the 69.4-acre campus Wikipedia gives (s13). The largest single campus parcel is 07-18-306-001 (6.16 acres, exempt). No sale is on the layer. |
Institution | —A |
| Moser Tower and Millennium Carillon 443 Aurora Ave, Naperville |
Civic | City of Naperville The parcel containing the tower's published coordinates (s10) is 07-13-438-002, billed to CITY OF NAPERVILLE at 303 Aurora Rd: 1.88 acres, class E, exemption code 5, no assessed value. Wikipedia gives the owner as the City of Naperville, the cost as $7.1 million and the opening as June 2000 (s10). The match is by point, not by address. |
Government | —B |
| Naper Settlement 523 S Webster St, Naperville |
Civic | City of Naperville The museum's published coordinates (s11) fall on two overlapping parcels, 07-24-201-009 (Aurora Ave) and 07-24-201-007 (220 Aurora Ave), both billed to CITY OF NAPERVILLE, exempt, each carrying 10.37 acres in the ACREAGE field. Wikipedia describes a 13-acre museum on land bequeathed to the City in 1936 (s11). |
Government | —B |
| HUB 1415 office campus 1415 W Diehl Rd, Naperville |
Office | OPI Notex Properties LLC Parcel 07-03-404-006, 52.38 acres, billed to OPI NOTEX PROPERTIES LLC at Newton, MA: $16,331,700 assessed ($5.89M land), about $49.0M at one-third (s7), the highest-assessed office parcel in Naperville's DuPage roll. Office Properties Income Trust (Newton, MA) carries HUB 1415, Naperville at $64.6M gross, built 2001, acquired 31 Dec 2018, pledged as first-lien collateral for its September 2029 notes, and has been in Chapter 11 since 30 Oct 2025 (s14). Its Exhibit 21 lists OPI Notex Holdings Trust, not the billed LLC (s15). |
REIT | —B |
| Nalco Water (Ecolab) campus 1601 W Diehl Rd, Naperville |
Office | Nalco Company Two parcels billed to NALCO COMPANY at St Paul, MN: 07-03-304-023 (63.75 acres, $8,532,480 assessed, $6.91M of it land) and 07-03-304-022 (15.98 acres of land, $1,730,828). Ecolab's Exhibit 21 lists Nalco Company LLC (s17), and Wikipedia gives Nalco's headquarters as Naperville and its owner as Ecolab (s18). The roll is the taxpayer record; the billed name lacks the 'LLC'. |
Public company | —B |
| Former Amoco research campus (INEOS) 150 W Warrenville Rd, Naperville |
Industrial | INEOS Four parcels billed to INEOS at League City, TX, 168.7 acres together, the largest private holding in Naperville's DuPage roll: 07-01-202-010 (122.1 acres, $13,193,636 assessed, $12.16M land), 08-06-101-010 (42.07 acres, $4.10M) and two small lots; $17,756,323 in all. Wikipedia lists 'Amoco (now BP and Ineos)' among Naperville's employers (s9) and BP America among the ten largest. The roll names only 'INEOS', with no legal suffix, so the exact INEOS entity is not established. |
Private company | —A |
| Main Street Promenade 1-55 S Main St, Naperville |
Retail | RPAI Naperville Main LLC (Kite Realty Group) Eight downtown parcels (3.0 acres) are billed to RPAI NAPERVILLE MAIN, RPAI NAPERVILLE MAIN LLC and RPAI NAPERVILLE MAIN NORT[H] at Indianapolis, IN, $13,790,380 assessed; the largest is 1 S Main St ($9,152,230). Kite Realty Group Trust, based in Indianapolis, lists Main Street Promenade in its 2025 Schedule III at $64.8M gross, built 2003, acquired 2021 (s16); Kite does not name the city or the LLC in the table, so the match is by name and mailing city. |
REIT | —B |
| CityGate Centre 2132 City Gate Ln, Naperville |
Mixed use | MQMF CityGate Owner LLC Parcel 07-03-103-025, 5.06 acres, billed to MQMF CITYGATE OWNER LLC at Dallas, TX: $15,933,326 assessed, all but $549,099 of it building, about $47.8M at one-third. Neighbouring CityGate parcels are billed to 2155 Citygate Lane LLC, 2191 Citi Gate Lane LLC and CityGate Centre II LLC, all at Naperville addresses. No document we opened names the LLC's members or what the 2132 building contains. |
Private company | —A |
| Water Street District 120-135 Water St, Naperville |
Mixed use | Marquette Water St Venture Four parcels billed to MARQUETTE WATER ST VENTUR(E) / VNTR, Naperville: 120 Water St (1.01 acres, $5,119,000 assessed), 123 Water St ($3,509,188), 135 Water St ($1,423,943) and a lot; $10,052,192 in all. The City of Naperville is billed for the adjoining 1.6-acre parcel at 120 Water St (exempt). No document we opened states the venture's members. |
Private company | —A |
2
The core land
The most valuable ground in the city, and what the public record says about it.
The most valuable ground in Naperville's DuPage roll is not downtown but along the I-88 corridor and in the large apartment complexes: the highest-assessed parcel is an apartment complex at 507 Railway Dr, and the biggest office parcel is HUB 1415 on Diehl Rd, owned by a REIT in Chapter 11. Values are the roll's assessed figures, which Illinois law sets at one-third of fair cash value outside Cook County (s7); market-value equivalents below are that multiplication, not appraisals. The Will County part of the city is not included.
Highest-assessed parcel$24.6M assessed (about $73.8M at one-third)
507 Railway Dr (07-16-201-024), 20.6 acres, class M, billed to Abacus Capital Group. DuPage County GIS parcel layer, Oct 2026 (s1).
Highest-assessed office parcel$16.3M assessed
HUB 1415, 1415 W Diehl Rd (07-03-404-006), OPI Notex Properties LLC; carried at $64.6M gross by Office Properties Income Trust (s14). Parcel layer (s1).
Assessed value of all Naperville parcels in DuPage County$7.39B (about $22.2B at one-third)
$7,389,649,185 total over 32,898 parcels, of which $5.67B residential (29,381 parcels), $1.05B commercial (1,157), $391M class M apartments (137) and $249M industrial (435); 674 parcels are exempt. Billed (taxable) value after exemptions $7.05B. Sum of the parcel layer, Oct 2026 (s1).
Transfer tax on a Naperville sale$1.00 state + $3.00 city per $1,000
Illinois 50 cents per $500 of declared value (s6); City of Naperville $3.00 per $1,000 (s4); the DuPage County rate was not stated on any page opened.
3
Who owns the town
At this scale the significant owner is rarely a trust or a fund: it is one or two local holding companies, a family in its second or third generation, and often the land around the town rather than the buildings in it.
Public bodies hold the largest blocks of Naperville ground on the DuPage side of the city, and they are layered: the Naperville Park District holds more land than the City itself, and the Forest Preserve District of DuPage County and Naperville CUSD 203 each hold about 300 to 350 acres. The largest private holding is the former Amoco research campus billed to INEOS (168.7 acres). There is little farmland left in DuPage Naperville; the city's growth edge lies in Will County, which could not be read. Figures are parcels billed to each body among the 32,898 parcels DuPage codes to Naperville; acres are the roll's ACREAGE field, which repeats a parent lot's area on condominium units, so acreage is given only for holders without condo units. Exempt parcels carry no assessed value.
| Name | Type | Holdings, DuPage County roll (Naperville), Oct 2026 |
|---|---|---|
| Naperville Park District Billed as NAPERVILLE PARK DISTRICT (108), NAPERVILLE PARK DIST (45) and four misspellings. The largest parcel is 2220 83rd St (156.36 acres), then Mill St (46.04) and Plank Rd (30.67); 500 W Jackson Ave (21.33 acres) is also district land. A handful of houses it holds on W 5th Ave carry $626,333 of assessed value. |
Government | 159 parcels, 871.5 acresA |
| City of Naperville Billed as CITY OF NAPERVILLE (146) and three variants, almost all exempt. The largest are 175 W Jackson Ave (51.8 acres; the roll puts that address on many scattered city parcels), Aurora Ave (23.47) and 180 Fort Hill Dr (22.75). Includes the Moser Tower and Naper Settlement parcels (see marquee). |
Government | 150 parcels, 457.4 acresA |
| Forest Preserve District of DuPage County Billed under six spellings (FOREST PRESERVE DISTRICT, FOREST PRESERVE DIST, DUPAGE CO FOREST PRESERVE and others), all exempt, mailing to Wheaton. The largest are on Herrick Rd (40.63 acres), 26W251 Warrenville Rd (35.22) and 25W705 Butterfield Rd (31.5). |
Government | 52 parcels, 355.7 acresA |
| Naperville Community Unit School District 203 Billed as SCHOOL DISTRICT NO 203 (37) and seven variants, all exempt. Largest: 440 Aurora Ave (28.59 acres) and two parcels at 899 N Mill St (22.29 and 19.28 acres). |
Government | 52 parcels, 299.0 acresA |
| Indian Prairie Community Unit School District 204 Billed as INDIAN PRAIRIE UNT 204, SCHOOL DISTRICT 204 and variants. District 204 serves the south and west of the city, much of it in Will County, so these are a fraction of its Naperville holdings. |
Government | 7 parcels, 67.8 acres (DuPage side only)A |
| INEOS The former Amoco research campus at 150 W Warrenville Rd (see marquee); the largest private landholding on Naperville's DuPage roll. |
Private company | 4 parcels, 168.7 acres, $17.76M assessedA |
| Nalco Company (Ecolab) The Nalco Water campus at 1601 W Diehl Rd (see marquee). |
Public company | 2 parcels, 79.7 acres, $10.26M assessedA |
| Nicor Gas (Southern Company) Billed as NICOR GAS / SOUTHERN CO at Atlanta, GA; the largest is 1900 Ferry Rd (21.27 acres, $10,332,000 assessed). Commonwealth Edison is billed for only one 0.22-acre lot: utility rights-of-way are not on this layer. |
Public company | 13 parcels, 72.4 acres, $11.63M assessedA |
| North Central College See marquee: 60 exempt campus parcels and 4 taxable houses. |
Institution | 64 parcels, 64.7 acresA |
| Catholic Diocese of Joliet Billed as DIOCESE OF JOLIET (29) and ROMAN CATHOLIC DIOCESE (1), all exempt; the largest is 1155 Aurora Ave (12.96 acres). |
Institution | 30 parcels, 59.2 acresA |
| Edward Health Services (Endeavor Health) The main campus at 801 S Washington St (four parcels, see marquee) and 1335 N Mill St (4.29 acres, $1.62M). |
Institution | 6 parcels, 55.0 acres, $10.0M assessed; plus 1 billed to Edward HospitalA |
| DuPage County Billed as DU PAGE COUNTY, DUPAGE COUNTY, COUNTY OF DU PAGE, DUPAGE COUNTY HWY DEPT and DU PAGE CO HEALTH DEPT. The State of Illinois is billed for one 3.06-acre parcel on Ogden Ave and the U.S. Postal Service for one 9.83-acre parcel on Book Rd; Naperville Township for its office at 139 W Water St. No housing authority parcel is billed in Naperville; DuPage Housing Solutions holds one. |
Government | 13 parcels, 15.1 acresA |
5
Who builds the houses
New-home building in this market: the volume, and the firms behind it. Ownership of a builder matters as much as its volume — a private-equity platform and a family firm behave differently.
Naperville is close to built out on its DuPage side. The Census Bureau counted 224 single-family homes permitted in the city in 2025 ($113.2M of construction) and 2 two-family buildings (4 units), with no buildings of five or more units, all 12 months reported. Will County, where the city's remaining greenfield lies, permitted 1,797 single-family homes county-wide against DuPage's 844. On the DuPage roll the builders are a mix of a national public builder finishing a subdivision and local custom-home firms rebuilding teardown lots. Figures are parcels billed to the builder on the DuPage roll, which are lots and unsold homes, not closings; Will County builder holdings could not be read.
| Name | Type | Parcels billed, DuPage roll (Naperville), Oct 2026 |
|---|---|---|
| M/I Homes of Chicago, LLC (M/I Homes, Inc.) Billed as M/I HOMES OF CHICAGO LLC (54) and M/I HOMES OF CHICAGO (4), carrying no assessed value yet (new lots). M/I Homes' 2025 Exhibit 21 says M/I Homes of Chicago, LLC is wholly owned by the company (s21). Roll is s1. |
Public company | 58 parcelsB |
| DJK Custom Homes, Inc. Billed as DJK CUSTOM HOMES INC (42), D J K CUSTOM HOMES INC (10), DJK CUSTOM HOMES (2) and a misspelling. A Naperville custom builder; not SEC-registered, and no source we opened describes its ownership. |
Private company | 55 parcels, $6.2M assessedA |
| PulteGroup (billed as 'Pulte Homes') Billed as PULTE HOMES with no legal suffix and no assessed value. PulteGroup's 2025 Exhibit 21 has no entity of exactly that name (it lists Pulte Home Company, LLC and Del Webb Communities of Illinois, Inc.) (s24), so the titled subsidiary is not established. |
Public company | 22 parcelsA |
| K. Hovnanian at Heatherfield, LLC (Hovnanian Enterprises) Billed as K HOVNANIAN AT HEATHERFI[ELD]. Hovnanian's FY2025 Exhibit 21 lists K. Hovnanian at Heatherfield, LLC (Illinois) and a GTIS-HOV Heatherfield Parent LLC joint-venture entity (s22). Roll is s1. |
Public company | 6 parcelsB |
| BHC Construction LLC No source we opened describes the company. |
Private company | 7 parcels, $3.0M assessedA |
| Autumn Homes Inc. No source we opened describes the company. |
Private company | 5 parcels, $0.66M assessedA |
6
Commercial landlords
The commercial side, counted separately from housing: who holds the office, retail and industrial floor area.
Naperville's largest private landlords on the DuPage roll are apartment owners, each billed for one large complex, followed by the office campuses along the I-88 corridor (Diehl and Warrenville Roads) and the downtown retail blocks. Most owners are single-asset LLCs whose members no filing we opened names. Single-family rental is small here: Tricon Residential is billed for 9 houses, American Homes 4 Rent entities for 5 and Invitation Homes' IH2/IH3 Illinois partnerships for 4. A warning on the billing name: the second-highest apartment parcel, 803 Corday Dr ($23.5M), is billed to RYAN PTS, a property-tax agent, and 504 N River Rd to CAPMARK, a lender, so the taxpayer is not always the owner and those two are not listed.
| Name | Type | Assessed value billed, DuPage roll (Naperville), Oct 2026 |
|---|---|---|
| Naperville Owner 1 LLC All at 1598 Fairway Dr, class M, mailing to Summit, NJ; the largest single taxpayer by value in Naperville's DuPage roll. No document we opened names its members. |
Private company | 43 parcels, $32.6M assessedA |
| Friedkin Property Group / Friedkin Realty Group Two apartment parcels, 504 Chamberlain Ln ($17,649,568) and 1373 Ivy Ln ($15,284,870), and the downtown block at 111-19 S Main St ($4,178,916 over two parcels), all mailing to San Francisco, CA. |
Private company | 4 parcels, $37.1M assessedA |
| Heritage Woods Towers LLC All at 701 Royal St George, class M, mailing to Lincolnwood, IL. |
Private company | 8 parcels, $25.0M assessedA |
| Abacus Capital Group 507 Railway Dr, 20.6 acres, class M, $22.06M of it building: the highest-assessed single parcel in Naperville's DuPage roll. Mailing address New York, NY. Billed under the firm's trade name; the titled entity is not on the layer. |
Private company | 1 parcel, $24.6M assessedA |
| Agellan Warrenville LP 1000 E Warrenville Rd (16.26 acres, $10,322,806) and 1100 E Warrenville Rd (14.34 acres, $8,293,717), mailing to Toronto, ON. |
Private company | 2 office parcels, $18.6M assessedA |
| Office Properties Income Trust (OPI Notex Properties LLC) HUB 1415, 1415 W Diehl Rd, in an owner that has been in Chapter 11 since 30 Oct 2025 (s14); see marquee. |
REIT | 1 office campus, $16.3M assessed; $64.6M gross in OPI's booksB |
| Kite Realty Group Trust (RPAI Naperville Main) Main Street Promenade downtown (see marquee). Kite also lists Naperville Marketplace ($17.2M gross, built 2008) in its Schedule III (s16); no parcel in Kite's or RPAI's name for it is on the DuPage roll, so it is presumably on the Will County side, which could not be read. |
REIT | 8 parcels, $13.8M assessed; $64.8M gross in Kite's booksB |
| BMO Bank NA The largest is 1200 Warrenville Rd (16.47 acres, $18,776,745). Wikipedia lists BMO Harris among Naperville's ten largest employers (1,200) (s9). |
Public company | 3 parcels, $21.0M assessedB |
?
Looked for and not found
Claims this page would have made if a source could be opened. They are left out rather than guessed.
- Everything in Will County: the southern part of Naperville (the 95th Street and Route 59 corridors, including Kite's Naperville Marketplace and most Indian Prairie District 204 land) is absent, because gis.willcountyillinois.com refused connections and Will County's property search is closed to crawlers. A search result describes the Will County tax-map parcel layer's terms as forbidding redistribution 'without explicit permission from the Will County GIS Department'; the page itself was not opened.
- Sale prices: none is quoted. PTAX-203 declarations are searchable in MyDec without an account according to the Department of Revenue, but the application needs a browser session; DuPage's own property-record pages were down for maintenance on 21 Oct 2026.
- The members or parents of Naperville Owner 1 LLC, MQMF CityGate Owner LLC, Marquette Water St Venture, Heritage Woods Towers LLC, Agellan Warrenville LP and the other single-asset LLCs: no filing we opened names them.
- That the billed taxpayer is the deed holder: the DuPage layer gives the billing name, which for 803 Corday Dr is a tax agent (Ryan PTS) and for 504 N River Rd a lender (Capmark). No deed was read.
- The link between OPI Notex Properties LLC (the billed name) and OPI Notex Holdings Trust (the name in OPI's Exhibit 21), and between Edward Health Services and Endeavor Health.
- The Naperville Municipal Center (400 S Eagle St): no parcel on the layer carries that address, and the roll lists many city parcels at 175 W Jackson Ave, so it is not placed.
- Railroad land: 124 parcels have no billing name or class, including the parcel under Naperville station (07-18-502-001); BNSF's holdings are not established.
§
Sources
- DuPage County ParcelsWithRealEstateCC FeatureServer, layer 0 'ParcelsRealEstate' (337,048 county parcels; 32,898 with MUNICIPALITY = Naperville; fields include BILLNAME, BILLCITY, PROPADDRL1, REA017_PROP_CLASS, REA017_FCV_LAND/IMP/TOTAL, EXEMPTCODE, ACREAGE, school and park districts). Description: 'maintained by the DuPage County Information Technology Department, GIS Division in conjunction with the DuPage County Clerk'; the real estate file 'is joined to the parcels on a weekly basis'. All Naperville rows read 21 Oct 2026 — DuPage County Information Technology Department, GIS Division · openA
- Forms and Fee Schedules: deeds (Document Class 1) $86.00; document copy fee $0.50 per page; certification fee $5.00 per document; 'All questions regarding Real Estate Transfer Declarations should be directed to the Illinois Department of Revenue' (MyDec) — DuPage County Recorder · openA
- Search Records Online: 'The Recorder's website provides access to indexed documents and digital images starting March 16, 1961'; property records searchable online 'from 1961 to present by name, 1985 to present by property parcel number (PIN), and 1995 to present by property address' — DuPage County Recorder · openA
- DuPage County Townships and Municipal Transfer Stamps: 'City of Naperville 630-420-6059 $3.00/$1,000 No Charge' (exemption stamp) — DuPage County Recorder · openA
- Property Transfer Tax Declarations and MyDec: 'MyDec at MyTax Illinois allows users to search for Illinois Real Estate Transfer Declarations (Forms PTAX-203, PTAX 203-A, PTAX 203-B) ... without logging in to a MyDec account' — Illinois Department of Revenue · openA
- 35 ILCS 200/31-10, Imposition of tax: tax on transferring title 'at the rate of 50¢ for each $500 of value or fraction of $500 stated in the declaration required by Section 31-25' — Illinois General Assembly · openA
- 35 ILCS 200/9-145, Statutory level of assessment: outside counties of more than 200,000 that classify, 'Each tract or lot of property shall be valued at 33 1/3% of its fair cash value' — Illinois General Assembly · openA
- Legal Disclaimer / Terms of Use (disclaimers of liability, warranty and endorsement; no clause restricting reuse of data) — DuPage County · openA
- Naperville, Illinois: city in DuPage and Will counties; population 149,540 at the 2020 census; 'Amoco (now BP and Ineos), Nalco, Calamos, Nicor, and Edward Hospital' among employers; Edward Hospital the largest employer (4,500) — Wikipedia · openA
- Moser Tower and Millennium Carillon: 443 Aurora Avenue; opened June 2000; cost $7.1 million; owner City of Naperville; 160 ft; coordinates 41.77004 N, 88.15672 W — Wikipedia · openA
- Naper Settlement: 13-acre outdoor history museum established 1969, 'situated on land bequeathed to the City of Naperville in 1936'; 523 S. Webster St.; coordinates 41°46′10″N 88°9′13″W — Wikipedia · openA
- Edward Hospital: main campus 801 South Washington Street, Naperville; part of Endeavor Health (formed 2022 from Edward-Elmhurst and NorthShore); 309 beds; non-profit; coordinates 41.76111 N, 88.14972 W — Wikipedia · openA
- North Central College: campus 69.4 acres; 2,695 students; affiliated with the United Methodist Church — Wikipedia · openA
- Office Properties Income Trust, Form 10-K 2025: Schedule III row 'HUB 1415 (8) Naperville, IL 1' (land $12,333K, buildings $52,260K, total $64,593K, acquired 12/31/2018, built 2001); footnote (8) 'These 19 properties are first lien collateral for the September 2029 Notes'; 'On October 30, 2025 ... OPI and certain of its subsidiaries ... voluntarily commenced cases ... under chapter 11' — U.S. Securities and Exchange Commission · openA
- Office Properties Income Trust, Form 10-K 2025, Exhibit 21.1 (lists 'OPI Notex Holdings Trust', Maryland) — U.S. Securities and Exchange Commission · openA
- Kite Realty Group Trust, Form 10-K 2025, Schedule III: 'Main Street Promenade' (land $2,630K, buildings $62,172K, total $64,802K, built 2003, acquired 2021) and 'Naperville Marketplace' (total $17,228K, built 2008) — U.S. Securities and Exchange Commission · openA
- Ecolab Inc., Form 10-K 2025, Exhibit 21 (lists 'Nalco Company LLC', Delaware) — U.S. Securities and Exchange Commission · openA
- Nalco Holding Company (Nalco Water, An Ecolab Company): wholly owned subsidiary; headquarters Naperville, Illinois; owner Ecolab — Wikipedia · openA
- Building Permits Survey, annual place file 2025, Midwest Region (row: Naperville, FIPS 17 place 51622, county 043; 12 months reported) — U.S. Census Bureau · openA
- Building Permits Survey, annual county file 2025 (rows: DuPage County 17-043; Will County 17-197) — U.S. Census Bureau · openA
- M/I Homes, Inc., Form 10-K 2025, Exhibit 21 ('M/I Homes of Chicago, LLC, a Delaware limited liability company ... is wholly-owned by the Company') — U.S. Securities and Exchange Commission · openA
- Hovnanian Enterprises, Inc., Form 10-K FY2025, Exhibit 21 (lists 'K. Hovnanian at Heatherfield, LLC', Illinois, and 'GTIS-HOV Heatherfield Parent LLC') — U.S. Securities and Exchange Commission · openA
- Invitation Homes Inc., Form 10-K 2025, Exhibit 21.1 (lists 'IH2 Property Illinois, L.P.' and 'IH3 Property Illinois, L.P.', Delaware) — U.S. Securities and Exchange Commission · openA
- PulteGroup, Inc., Form 10-K 2025, Exhibit 21 (lists 'Pulte Home Company, LLC' and 'Del Webb Communities of Illinois, Inc.'; no entity named exactly 'Pulte Homes') — U.S. Securities and Exchange Commission · openA
- DuPage County Property Records Search (home page: search by PIN, address, billing name or map; 21 Oct 2026 banner 'The System is currently unavailable due to maintenance') — DuPage County · openA