Boulder County property record for 70 S 31st St, Boulder, CO 80305
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3.25 ba · 2,743 sqft · built 1955 |
| Lot Size | 0.165 acres (7,200 sqft) |
| Owner | Company Name on File |
| Last Sale | $1,629,744 (Dec 2021) |
| Tax Bill | $8,004 (2025) |
| Deeds & Mortgages | Aug 2022 Mortgage Dec 2021 Sale & Mortgage + 1 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 1577-05-3-16-007 |
| Primary APN | 1577-05-3-16-007 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3.25 Baths |
| Half Baths | 2 Half Baths |
| Total Rooms | 9 Rooms |
| Stories | 1 Story |
| Building Area | 2,743 sqft Living Area |
| Gross Area | 3,304 sqft |
| 1st Floor Area | 1,681 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1955 |
|---|---|
| Effective Year Built | Effective 2007 |
| Architectural Style | Ranch |
| Exterior Material | Brick Veneer |
| Construction Type | Masonry / Concrete Block |
| Lot Area | 7,200 sqft (0.165 acres) |
| Garage Type | Attached |
| Garage Area | 561 sqft |
| Cooling System | Central |
|---|---|
| Heating System | Forced Air with A/C |
| Account Number | R0003358 |
|---|---|
| Street Address | 70 S 31ST ST |
| City | BOULDER |
| State | CO |
| Zip | 80305-3407 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 9 BLK 13 HIGHLAND PARK 3 |
| Legal Range | 70 |
| Legal Township | 1S |
| Legal Section | 05 |
| Legal Subdivision | HIGHLAND PARK 3 - BO |
| Legal Block | 13 |
| Legal Lot Number | 9 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 2 |
| Census Block | 2009 |
| Census Tract | 12507 |
70 S 31st St is owned by a company that bought it in December 2021.
Source: Boulder County records, as of September 18, 2026
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | 70 S 31ST ST, BOULDER, CO 80305-3407 |
| Owner Type | Company |
| Vesting | Limited Liability Company |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Aug 31, 2022 | Deed of Trust, Mortgage · Conventional Mortgage KEY BANK NA |
| Dec 13, 2021 | Special Warranty Deed, Transfer · ARM KEY BANK NA |
| Oct 21, 2019 | Warranty Deed, Transfer FIDELITY NATIONAL TITLE, FIDELITY NATIONAL TITLE INSURA |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Dec 13, 2021 · Amount on File |
| Deed Sale | Dec 13, 2021 · Amount on File |
| Prior Sale | Oct 21, 2019 · Amount on File |
| Deed Document Number | 20213933723 |
| Prior Transfer Date | Jun 27, 2005 |
| Prior Transfer Doc | 0002701251 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | BOULDER CO |
| Property Address | 70 S 31ST ST, BOULDER, CO 80305-3407 |
| Transaction Type | Mortgage |
| Record Updated | Sep 14, 2022 |
| Title Company | HERITAGE TITLE COMPANY |
| Name | Verified Name |
|---|
| Document Number | 0003979414 |
|---|---|
| Date | Aug 31, 2022 |
| Instrument | 3979414 |
| Name | KEY BANK NA |
|---|---|
| Type | Bank |
| Address | CLEVELAND, OH 44114 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 356 Months |
| Due | Apr 1, 2052 |
| Rate Type | Adjustable Rate |
|---|---|
| Rate | 2.25% |
| Adjustable | Adjustable Rate Rider |
| Type Change Date | Jan 1, 2032 |
| Change Frequency | 6 Months |
| Min Rate At Change | 3% |
| Max Rate At Change | 7.25% |
| Index | Other |
| Margin | 3 |
| Max Rate | 7.25% |
| Document Type | Special Warranty Deed |
|---|---|
| Jurisdiction | BOULDER CO |
| Recording Date | Dec 13, 2021 |
| Property Address | 70 S 31ST ST, BOULDER, CO 80305-3407 |
| Document Number | 0003933723 |
| Instrument Date | Nov 19, 2021 |
| Instrument | 3933723 |
| Transaction Type | Transfer |
| Record Updated | Dec 31, 2021 |
| Title Company | HERITAGE TITLE COMPANY |
| Amount | Amount on Record |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $162.97 |
| Amount Accuracy | Full Amount Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 70 S 31ST ST, BOULDER, CO 80305-3407 |
| Document Number | 0003933725 |
|---|---|
| Date | Dec 13, 2021 |
| Instrument | 3933725 |
| Name | KEY BANK NA |
|---|---|
| Type | Bank |
| Type | ARM |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Jan 1, 2052 |
| Rate Type | Adjustable Rate |
|---|---|
| Rate | 2.25% |
| Adjustable | Adjustable Rate Rider |
| Type Change Date | Jan 1, 2032 |
| Change Frequency | Annually |
| Min Rate At Change | 3% |
| Max Rate At Change | 7.25% |
| Index | Other |
| Margin | 3 |
| Max Rate | 7.25% |
| Document Type | Warranty Deed |
|---|---|
| Jurisdiction | BOULDER CO |
| Recording Date | Oct 21, 2019 |
| Property Address | 70 S 31ST ST, BOULDER, CO 80305-3407 |
| Document Number | 0003743657 |
| Instrument Date | Oct 15, 2019 |
| Instrument | 3743657 |
| Transaction Type | Transfer |
| Record Updated | Oct 29, 2019 |
| Title Company | FIDELITY NATIONAL TITLE, FIDELITY NATIONAL TITLE INSURA |
| Amount | Amount on Record |
|---|---|
| Tax | $52.00 |
| Amount Accuracy | Confirmed |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Company |
| Address | 2210 BLAKE ST #401 DENVER CO 802052040, 401, DENVER, CO 80205-2040 |
The 2025 property tax bill for 70 S 31st St was $8,004, down 1.1% from the year before.
Source: Boulder County assessment roll, as of September 18, 2026
| Type | Name |
|---|---|
| State | Colorado |
| County | Boulder County |
| Municipality | Boulder City |
| Unified School District | Boulder Valley School District RE-2 (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $86,571 (+3.13%) Land $26,690 Building $59,881 | $1,343,100 (-) Land $462,500 Building $880,600 | |
| 2025 | $8,004.00 (-1.09%) | $83,944 Land $28,906 Building $55,038 | $1,343,100 Land $462,500 Building $880,600 |
| 2024 | $8,092.00 (+1.76%) | ||
| 2023 | $7,952.00 (+26.73%) | $95,770 (+41.71%) Land $34,003 Building $61,767 | $1,429,400 (+47%) Land $507,500 Building $921,900 |
| 2022 | $6,275.00 | $67,582 Land $25,750 Building $41,832 | $972,400 Land $370,500 Building $601,900 |
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.
FEMA maps place 70 S 31st St in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 2013.
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 |
| Community Rating System | Class 5 (25% premium discount) |
| Nearby Flood Policies | 9 in force |
| 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 risk around 70 S 31st St is moderate, ranking above 59% of the US, with a 0.2% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 59% of the US · above 44% of Colorado |
|---|---|
| Wildfire Likelihood | 0.2% annual chance |
| Exposure | None beyond ember reach |
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
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 |
| 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.
Source: FCC Broadband Data Collection, based on 294 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 | 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 |
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