3685 E 121st Ave, Thornton, CO 80241 Property Records

Adams County property record for 3685 E 121st Ave, Thornton, CO 80241 · Last verified February 2026

Property Highlights

Property Type	Commercial > Office > Professional Building (Legal, Insurance, Real Estate, Business)
Architecture Style	Other
Year Built	Built 2005
Square Footage	757 sqft Total Area
Lot Size	196,630 sqft (4.51 acres)
Garage	Attached, 484 sqft
Occupancy	Owner Occupied
Tax Bill	$71,244.00 (2025)

Property Details

APN / Parcel Number

Primary APN	`R0161412`
Alternative APNs	`0157336410159` `157336410159`

Interior

Building Area	757 sqft Total Area
Basement Area	1,145 sqft Basement
Stories	2 Stories

Exterior

Year Built	Built 2005
Architectural Style	Other Style
Roof Construction	Gable Roof Construction
Lot Area	196,630 sqft (4.51 acres)
Parking Spaces	2 Parking Spaces
Garage Type	Attached Garage
Garage Area	484 sqft Garage
Total Buildings	9 Total Buildings

Utilities and HVAC

Cooling System	Central Cooling
Heating System	Forced Air Heating

Location & Zoning

Account Number	R0161412
Old Parcel Number	157336410159
Street Address	3685 E 121ST AVE
City	THORNTON
State	CO
Zip	80241-3585
Property Usage	Commercial Property Usage
Type	Commercial > Office > Professional Building (Legal, Insurance, Real Estate, Business)
Legal Description	SUB:THORNTON RIDGE FILING #1 AMENDMENT #1 BLK:1 LOT:1-A
Legal Range	68W
Legal Township	01S
Legal Section	36
Legal Quarter	SE
Legal Subdivision	THORNTON RIDGE FILING #1 AMENDMENT #1
Legal Block	1
Legal Lot Number	1-A
Jurisdiction	ADAMS CO
Minor Civil Division	WEST ADAMS
Census Blockgroup	2
Census Block	2000
Census Tract	8555

Owner

Source: Adams County records · APN R0161412

Assessment roll updated August 25, 2025 · Last verified February 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record	Individual Owner on File
Mailing Address	3685 E 121ST AVE, THORNTON, CO 80241-3585
Occupancy	Owner Occupied
Owner Type	Owner is a Company

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	Verified Name on Deed
Known Transactions	Sep 28, 2021 Jun 07, 2011
Deed Doc Number	2021000114423
Record Refreshed	Jun 08, 2026

September 2021: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	ADAMS CO
Recording Date	Sep 28, 2021
Property Address	3685 E 121ST AVE, THORNTON, CO 80241-3585
Document Number	0000114423
Instrument Date	Sep 24, 2021
Instrument	2021000114423
Transaction Type	Transfer
Record Updated	Oct 05, 2021

Transaction

Tax	$0.00
Amount Accuracy	Zero or No Consideration Stated
Additional	Arms Length Transaction

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	3685 E 121ST AVE, THORNTON, CO 80241-3585

Tax Assessment & Valuation

Source: Adams County records · Assessment roll updated August 25, 2025 · Last verified February 2026

Property Jurisdictions

Type	Name
State	Colorado
County	Adams County
Municipality	Thornton City
Unified School District	Adams 12 Five Star Schools (PK - 12)

Tax Bill & Assessment History

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

Year	Tax Bill	Assessed Value	Assessed Market Value
2025	$71,244.00 (-45.46%)	$1,680,130 (-1.19%) Land $530,920 Building $1,149,210	$6,222,674 (+46.42%) Land $1,966,360 Building $4,256,314
2023	$130,632.00 (+4%)	$1,700,360 (+49.13%) Land $548,610 Building $1,151,750	$4,250,000 (+8.09%) Land $1,966,360 Building $2,283,640
2022	$125,606.00	$1,140,220 Land $209,840 Building $930,380	$3,931,810 Land $723,620 Building $3,208,190