870 15th St, Boulder, CO 80302 Property Records

Boulder County property record for 870 15th St, Boulder, CO 80302

Property Summary

Property Type	Multi-Family Dwellings
Details	5 bd · 2 ba · 2,534 sqft · built 1922
Lot Size	0.144 acres (6,256 sqft)
Owner	Company Name on Record
Last Sale	$1,650,000 (Sep 2021)
Tax Bill	$10,509 (2025)
Deeds & Mortgages	Sep 2021 Sale Feb 2019 Sale + 2 more
Flood Zone	Zone X (minimal risk)
APN	`1463-31-3-19-003`

Property Details

APN / Parcel Number

Primary APN	`1463-31-3-19-003`
Alternative APNs	`R0006320` `0006320`

Interior

Bedrooms	5 Beds
Full Baths	2 Baths
Total Rooms	8 Rooms
Units	2 Units
Stories	1 Story
Building Area	2,534 sqft Living Area
Gross Area	2,887 sqft
1st Floor Area	1,476 sqft
Basement Area	1,411 sqft
Finished Basement	1,058 sqft
Unfinished Basement	353 sqft
Interior Walls	Wallboard/Drywall

Exterior

Year Built	Built 1922
Effective Year Built	Effective 1990
Architectural Style	Ranch
Exterior Material	Combination
Construction Type	Masonry / Concrete Block
Roof Material	Asphalt
Lot Area	6,256 sqft (0.144 acres)
Garage Type	Carport
Garage Area	378 sqft
Carport	Carport
Carport Area	378 sqft
Parking Spaces	1 Parking Space
Porch	Porch
Porch Area	28 sqft
Deck Area	460 sqft

Utilities, Heating & Cooling

Heating System	Hot Water

Location & Zoning

Account Number	R0006320
Street Address	870 15TH ST
City	BOULDER
State	CO
Zip	80302-7624
Property Category	Residential
Property Type	Residential > Multi-Unit > Multi-Family Dwellings
Legal Description	LOT 7 & 8 BLK 21 UNIVERSITY PLACE
Legal Range	70
Legal Township	1N
Legal Section	31
Legal Subdivision	UNIVERSITY PLACE - BO
Legal Block	21
Legal Lot Number	7
Jurisdiction	BOULDER CO
Township / Civil Division	BOULDER
Census Block Group	2
Census Block	2002
Census Tract	12401

Owner

Source: Boulder County records, as of September 18, 2026

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

Owner of Record	Company Name on Record
Mailing Address	26620 ALSACE DR, CALABASAS, CA 91302-3806
Owner Type	Company
Vesting	Trust, Family Trust

Deeds, Mortgages & Sale History

Date	Document
Sep 13, 2021	Warranty Deed, Transfer HERITAGE TITLE COMPANY, HERITAGE TITLE CO
Feb 7, 2019	Warranty Deed, Transfer FIDELITY NATIONAL TITLE, FIDELITY NATIONAL TITLE INSURA
Apr 17, 2017	Quit Claim Deed, Transfer Quitclaim
Feb 6, 2017	Warranty Deed, Transfer · ARM GUARANTY BANK & TRUST CO

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Sep 13, 2021 · Amount on Record
Deed Sale	Sep 13, 2021 · Amount on Record
Prior Sale	Feb 7, 2019 · Amount on Record
Deed Document Number	20213913159
Prior Transfer Date	Oct 14, 2008
Prior Transfer Doc	0002960659
Record Updated	Oct 29, 2026

September 2021: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Sep 13, 2021
Property Address	870 15TH ST, BOULDER, CO 80302-7624
Document Number	0003913159
Instrument Date	Sep 7, 2021
Instrument	3913159
Transaction Type	Transfer
Record Updated	Apr 15, 2022
Title Company	HERITAGE TITLE COMPANY, HERITAGE TITLE CO

Transaction

Amount	Amount Recorded
Tax	$165.00
Amount Accuracy	Full Amount Stated
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Family Trust
Address	26620 ALSACE DR, CALABASAS, CA 91302-3806

February 2019: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Feb 7, 2019
Property Address	870 15TH ST, BOULDER, CO 80302-7624
Document Number	0003697300
Instrument Date	Feb 6, 2019
Instrument	3697300
Transaction Type	Transfer
Record Updated	Feb 14, 2019
Title Company	FIDELITY NATIONAL TITLE, FIDELITY NATIONAL TITLE INSURA

Transaction

Amount	Amount Recorded
Tax	$135.00
Amount Accuracy	Confirmed
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Company
Address	1805 LAGOON VIEW DR TIBURON CA 949201807, TIBURON, CA 94920-1807

April 2017: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	BOULDER CO
Recording Date	Apr 17, 2017
Property Address	870 15TH ST, BOULDER, CO 80302-7624
Document Number	0003586879
Instrument Date	Feb 7, 2017
Instrument	3586879
Transaction Type	Transfer
Record Updated	Apr 28, 2017

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants with Right of Survivorship
Address	870 15TH ST BOULDER CO 803027624, BOULDER, CO 80302-7624

February 2017: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Feb 6, 2017
Property Address	870 15TH ST, BOULDER, CO 80302-7624
Document Number	0003573556
Instrument Date	Jan 31, 2017
Instrument	3573556
Transaction Type	Transfer
Record Updated	Apr 15, 2022

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$115.00
Amount Accuracy	Full Amount Stated
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name
Address	00000

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Tenants in Common
Address	870 15TH ST, BOULDER, CO 80302-7624

Mortgage

Document Number	0003573557
Date	Feb 6, 2017
Instrument	3573557

Lender

Name	GUARANTY BANK & TRUST CO
Type	Bank

Agreement

Type	ARM
Amount	Amount Recorded
Term	360 Months
Due	Feb 1, 2047

Interest

Rate Type	Adjustable Rate
Rate	3%
Type Change Date	Feb 1, 2022
Change Frequency	Annually
Min Rate At Change	3.5%
Max Rate At Change	5%
Index	1-Year CMT
Max Rate	8%

Tax Assessment & Valuation

Source: Boulder County assessment roll, as of September 18, 2026

Property Jurisdictions

Type	Name
State	Colorado
County	Boulder County
Municipality	Boulder City
Unified School District	Boulder Valley School District RE-2 (PK - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$114,240 (+4.45%) Land $64,600 Building $49,640	$1,750,000 (-) Land $950,000 Building $800,000
2025	$10,509.00 (+4.42%)	$109,375 (-8.37%) Land $59,375 Building $50,000	$1,750,000 (-1.77%) Land $950,000 Building $800,000
2023	$10,064.00 (+6.08%)	$119,363 (+17.77%) Land $56,166 Building $63,197	$1,781,545 (+19.53%) Land $838,300 Building $943,245
2022	$9,487.00	$101,354 Land $45,023 Building $56,331	$1,490,500 Land $662,100 Building $828,400

Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.

Flood

Source: FEMA National Flood Hazard Layer, effective October 14, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it
Nearby Flood Claims	1 (2013)
Claims Outside the SFHA	1 of 1
Most Recent Claim	Sep 2013 · Severe Storms, Flooding, Landslides, And Mudslides

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Wildfire

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire Risk	Low lower than 66% of the US · lower than 83% of Colorado
Wildfire Likelihood	0.03% annual chance
Exposure	None beyond ember reach

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water System	CITY OF BOULDER serves 166,080 people · EPA ID CO0107152
Water Source	Surface water
Last State Inspection	Sep 2024
Lead	2 ppb (2023–2025) action level 15 ppb

Violations Reported to EPA

Water Quality	Haloacetic acids resolved · Jul 2017
Treatment and Procedure	None last 10 years
Monitoring and Reporting	1 last 3 years

Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.

Internet Providers

Source: FCC Broadband Data Collection, based on 367 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Ayva Networks Fixed Wireless	2,500 / 2,500
CenturyLink Fiber · DSL in parts of the area	2,000 / 1,000
Xfinity Cable	2,000 / 250
Verizon Fixed Wireless	300 / 20
LiveWireNet Fixed Wireless	250 / 100
T-Mobile Fixed Wireless	100 / 20

May also be available: AT&T, Magnolia Road Internet Cooperative.

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