Boulder County property record for 4435 Mast Rd, Boulder, CO 80301
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2 ba · 1,660 sqft · built 1975 |
| Lot Size | 0.146 acres (6,347 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $450,000 (Mar 2016) |
| Tax Bill | $4,204 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1463-14-2-14-002 |
| Primary APN | 1463-14-2-14-002 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 7 Rooms |
| Building Area | 1,660 sqft Living Area |
| Gross Area | 1,912 sqft |
| 1st Floor Area | 844 sqft |
| Basement Area | 816 sqft |
| Finished Basement | 816 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1975 |
|---|---|
| Effective Year Built | Effective 1975 |
| Architectural Style | Bi-Level |
| Exterior Material | Wood Shingle |
| Construction Type | Frame |
| Roof Material | Asphalt |
| Lot Area | 6,347 sqft (0.146 acres) |
| Garage Type | Attached |
| Garage Area | 252 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Forced Air with A/C |
| Account Number | R0038552 |
|---|---|
| Street Address | 4435 MAST RD |
| City | BOULDER |
| State | CO |
| Zip | 80301-3182 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | SR |
| Legal Description | LOT 2 BLK 12 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 | 12,10 |
| Legal Lot Number | 2 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 1 |
| Census Block | 1000 |
| Census Tract | 12708 |
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 | 2 Individual Names on Record |
|---|---|
| Mailing Address | 4774 SADDLEWOOD CIR, JOHNSTOWN, CO 80534-8229 |
| Owner Type | Individual |
| Vesting | Joint Tenants |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Mar 31, 2016 · Amount on Record |
| Deed Sale | Mar 31, 2016 · Amount on Record |
| Prior Sale | Mar 20, 2015 · Amount on Record |
| Deed Document Number | 20163509423 |
| Prior Transfer Date | Oct 2, 2012 |
| Prior Transfer Doc | 0003259001 |
| Record Updated | Oct 29, 2026 |
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 | $40,931 (-2.08%) Land $15,071 Building $25,860 | $668,800 (-) Land $288,500 Building $380,300 | |
| 2025 | $4,204.00 (+12.83%) | $41,800 (-6.1%) Land $18,031 Building $23,769 | $668,800 (+0.66%) Land $288,500 Building $380,300 |
| 2023 | $3,726.00 (+15.32%) | $44,515 (+34.93%) Land $17,259 Building $27,256 | $664,400 (+39.96%) Land $257,600 Building $406,800 |
| 2022 | $3,231.00 | $32,991 Land $13,156 Building $19,835 | $474,700 Land $189,300 Building $285,400 |
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.
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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 65% of the US · lower than 82% of Colorado |
|---|---|
| Wildfire Likelihood | 0.05% 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 |
5G (outdoors only) and 4G LTE
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