Boulder County property record for 4235 Grinnell Ave, Boulder, CO 80305
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2 ba · 1,800 sqft · built 1968 |
| Lot Size | 0.283 acres (12,340 sqft) |
| Owner | Individual Name on File |
| Last Sale | $617,000 (Aug 2014) |
| Tax Bill | $6,444 (2025) |
| Deeds & Mortgages | Apr 2021 Mortgage Sep 2019 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 1577-08-4-07-035 |
| Primary APN | 1577-08-4-07-035 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 7 Rooms |
| Stories | 1 Story |
| Building Area | 1,800 sqft Living Area |
| 1st Floor Area | 900 sqft |
| Basement Area | 900 sqft |
| Finished Basement | 900 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1968 |
|---|---|
| Effective Year Built | Effective 1975 |
| Architectural Style | Ranch |
| Exterior Material | Aluminum/Vinyl |
| Construction Type | Frame |
| Roof Material | Asphalt |
| Lot Area | 12,340 sqft (0.283 acres) |
| Garage Type | Carport |
| Garage Area | 418 sqft |
| Carport | Carport |
| Carport Area | 418 sqft |
| Parking Spaces | 2 Parking Spaces |
| Deck Area | 264 sqft |
| Patio Area | 432 sqft |
| Cooling System | Central |
|---|---|
| Heating System | Forced Air with A/C |
| Account Number | R0012723 |
|---|---|
| Street Address | 4235 GRINNELL AVE |
| City | BOULDER |
| State | CO |
| Zip | 80305-6608 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 35 BLK 18 TABLE MESA 2 |
| Legal Range | 70 |
| Legal Township | 1S |
| Legal Section | 08 |
| Legal Subdivision | TABLE MESA 2 |
| Legal Block | 18 |
| Legal Lot Number | 35 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 1 |
| Census Block | 1015 |
| Census Tract | 12509 |
4235 Grinnell Ave is owned and occupied by an individual who bought it in August 2014.
Source: Boulder County records, as of October 19, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 4235 GRINNELL AVE, BOULDER, CO 80305-6608 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
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 |
|---|---|
| Apr 14, 2021 | Deed of Trust, Mortgage · Conventional Mortgage UNITED WHOLESALE MORTGAGE |
| Sep 24, 2019 | Deed of Trust, Mortgage · Conventional Mortgage UNITED WHOLESALE MORTGAGE |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Aug 12, 2014 · Amount on File |
| Deed Sale | Aug 12, 2014 · Amount on File |
| Prior Sale | Oct 28, 2010 · Amount on File |
| Deed Document Number | 20143396861 |
| Prior Transfer Date | Feb 6, 2006 |
| Prior Transfer Doc | 0002758240 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | BOULDER CO |
| Property Address | 4235 GRINNELL AVE, BOULDER, CO 80305-6608 |
| Transaction Type | Mortgage |
| Record Updated | Apr 28, 2021 |
| Title Company | NOT AVAILABLE, FNTC |
| Name | Verified Name |
|---|
| Document Number | 0003876929 |
|---|---|
| Date | Apr 14, 2021 |
| Instrument | 3876929 |
| Name | UNITED WHOLESALE MORTGAGE |
|---|---|
| Type | Mortgage Company |
| Address | PONTIAC, MI 48341 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | May 1, 2051 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | BOULDER CO |
| Property Address | 4235 GRINNELL AVE, BOULDER, CO 80305-6608 |
| Transaction Type | Mortgage |
| Record Updated | Feb 5, 2021 |
| Title Company | FIDELITY NATIONAL TITLE |
| Name | Verified Name |
|---|
| Document Number | 0003738014 |
|---|---|
| Date | Sep 24, 2019 |
| Instrument | 3738014 |
| Name | UNITED WHOLESALE MORTGAGE |
|---|---|
| Type | Mortgage Company |
| Address | PONTIAC, MI 48341 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Oct 1, 2049 |
The 2025 property tax bill for 4235 Grinnell Ave was $6,444.
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 | $68,775 (+1.76%) Land $61,421 Building $7,354 | $1,081,400 (-) Land $973,260 Building $108,140 | |
| 2025 | $6,444.00 | $67,588 Land $60,829 Building $6,759 | $1,081,400 Land $973,260 Building $108,140 |
| 2023 | $6,292.00 (+13.06%) | $76,548 (+27.73%) Land $68,893 Building $7,655 | $1,142,500 (+32.49%) Land $1,028,250 Building $114,250 |
| 2022 | $5,565.00 | $59,930 Land $53,937 Building $5,993 | $862,300 Land $776,070 Building $86,230 |
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 4235 Grinnell Ave in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 1998.
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 | 7 in force |
| Nearby Flood Claims | 1 (1998) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Feb 1998 · tidal / storm surge |
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 4235 Grinnell Ave is moderate, ranking above 62% of the US, with a 0.3% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 62% of the US · above 50% of Colorado |
|---|---|
| Wildfire Likelihood | 0.3% annual chance |
| Exposure | Indirect within ember reach |
| Adjoins Burnable Land | Yes |
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 604 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 |
May also be available: AT&T, T-Mobile.
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