Boulder County property record for 4434 Mast Rd, Boulder, CO 80301
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1.5 ba · 1,260 sqft · built 1976 |
| Lot Size | 0.151 acres (6,556 sqft) |
| Owner | Trust Name on File |
| Last Sale | $710,000 (Apr 2025) |
| Tax Bill | $3,951 (2025) |
| Deeds & Mortgages | Jul 2026 Mortgage Dec 2025 Sale |
| Flood Zone | Zone X (minimal risk) |
| APN | 1463-14-2-15-030 |
| Primary APN | 1463-14-2-15-030 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 6 Rooms |
| Building Area | 1,260 sqft Living Area |
| Gross Area | 1,628 sqft |
| 1st Floor Area | 1,044 sqft |
| Basement Area | 216 sqft |
| Finished Basement | 216 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1976 |
|---|---|
| Effective Year Built | Effective 1998 |
| Architectural Style | Split Level |
| Exterior Material | Wood Shingle |
| Construction Type | Frame |
| Lot Area | 6,556 sqft (0.151 acres) |
| Garage Type | Attached |
| Garage Area | 288 sqft |
| Parking Spaces | 1 Parking Space |
| Porch | Enclosed Porch |
| Porch Area | 80 sqft |
| Patio Area | 112 sqft |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0070817 |
|---|---|
| Street Address | 4434 MAST RD |
| City | BOULDER |
| State | CO |
| Zip | 80301-3114 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | SR |
| Legal Description | LOT 30 BLK 11 TWIN LAKES 2 REPLAT OF BLKS 10 11 & 12 |
| Legal Range | 70 |
| Legal Township | 1N |
| Legal Section | 14 |
| Legal Subdivision | TWIN LAKES 1,2 & REPLATS - BOV |
| Legal Block | 11,10 |
| Legal Lot Number | 30 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 1 |
| Census Block | 1000 |
| Census Tract | 12708 |
4434 Mast Rd is owner-occupied and held in a trust since December 2025.
Source: Boulder County records, as of September 18, 2026
| Owner of Record | Trust Name on File |
|---|---|
| Mailing Address | 4434 MAST RD, BOULDER, CO 80301-3114 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
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 |
|---|---|
| Jul 20, 2026 | Deed of Trust, Mortgage · Conventional Mortgage CHOICE LENDING |
| Dec 22, 2025 | Special Warranty Deed, Transfer |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Apr 8, 2025 · Amount on File |
| Deed Sale | Apr 8, 2025 · Amount on File |
| Prior Sale | Dec 17, 1992 · Amount on File |
| Deed Document Number | 20254082512 |
| Last Transfer Date | Dec 18, 2025 |
| Transfer Doc | 0004114173 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | BOULDER CO |
| Recording Date | Jul 20, 2026 |
| Property Address | 4434 MAST RD, BOULDER, CO 80301-3114 |
| Document Number | 0004140440 |
| Instrument Date | Jul 13, 2026 |
| Instrument | 20264140440 |
| Transaction Type | Mortgage |
| Record Updated | Jul 30, 2026 |
| Title Company | NONE LISTED ON DOCUMENT |
| Name | Verified Name |
|---|---|
| Relationship | Trust, 212 |
| Address | 4434 MAST RD, BOULDER, CO 80301-3114 |
| Document Number | 0004140440, |
|---|---|
| Date | Jul 20, 2026 |
| Instrument | 20264140440 |
| Name | CHOICE LENDING |
|---|
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 240 Months |
| Due | Aug 1, 2046 |
| Rate Type | Fixed Rate |
|---|---|
| Rate | 6.52% |
| Initial Type | Fixed Rate |
| Max Rate | -1% |
| Document Type | Special Warranty Deed |
|---|---|
| Jurisdiction | BOULDER CO |
| Recording Date | Dec 22, 2025 |
| Property Address | 4434 MAST RD, BOULDER, CO 80301-3114 |
| Document Number | 0004114173 |
| Map Reference | DOC 203997 |
| Instrument Date | Dec 18, 2025 |
| Instrument | 4114173 |
| Transaction Type | Transfer |
| Record Updated | Jan 16, 2026 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | No Consideration Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 4434 MAST RD, BOULDER, CO 80301-3114 |
The 2025 property tax bill for 4434 Mast Rd was $3,951, up 11.1% from the year before.
Source: Boulder County assessment roll, as of September 18, 2026
| Type | Name |
|---|---|
| State | Colorado |
| County | Boulder County |
| Unified School District | Boulder Valley School District RE-2 (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $44,125 (+12.4%) Land $15,177 Building $28,948 | $718,900 (+14.46%) Land $293,200 Building $425,700 | |
| 2025 | $3,951.00 (+11.08%) | $39,256 (+2.45%) Land $18,325 Building $20,931 | $628,100 (+0.19%) Land $293,200 Building $334,900 |
| 2024 | $3,557.00 (+1.66%) | $38,317 (-8.78%) Land $13,855 Building $24,462 | $626,900 (-) Land $261,800 Building $365,100 |
| 2023 | $3,499.00 (+15.14%) | $42,003 (+35.45%) Land $17,541 Building $24,462 | $626,900 (+40.5%) Land $261,800 Building $365,100 |
| 2022 | $3,039.00 | $31,011 Land $13,372 Building $17,639 | $446,200 Land $192,400 Building $253,800 |
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 4434 Mast Rd in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective October 14, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
Wildfire risk around 4434 Mast Rd is moderate, ranking above 62% 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 62% of the US · above 50% of Colorado |
|---|---|
| Wildfire Likelihood | 0.2% annual chance |
| Exposure | Direct burnable vegetation |
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 334 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Ayva Networks Fixed Wireless | 2,500 / 2,500 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| LiveWireNet Fixed Wireless | 250 / 100 |
| CenturyLink DSL | 140 / 20 |
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