Boulder County property record for 550 Mapleton Ave, Boulder, CO 80304 · Last verified June 2026
| Property Type | Residential > Single Family > Home |
|---|---|
| Bedrooms | 3 Beds |
| Bathrooms | 4.5 Baths |
| Year Built | Built 2010 |
| Square Footage | 5,952 sqft Living Area |
| Lot Size | 14,478 sqft (0.332 acres) |
| Garage | Detached, 440 sqft |
| Last Sale | $4,500,000 (2021) |
| Tax Bill | $32,245.00 (2025) |
| Primary APN | 1461-25-4-08-001 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 4.5 Baths |
| Partial Baths | 5 Partial Baths |
| Total Rooms | 12 Rooms |
| Building Area | 5,952 sqft Living Area |
| Gross Area | 6,121 sqft Gross Area |
| 1st Floor | 1,810 sqft 1st Floor |
| Upper Floors | 2,187 sqft Upper Floors |
| Basement Area | 1,693 sqft Basement |
| Finished Basement | 1,524 sqft Finished |
| Unfinished Basement | 169 sqft Unfinished |
| Stories | 2 Stories |
| Interior Structure | Wallboard/Drywall Interior Structure |
| Year Built | Built 1900 |
|---|---|
| Effective Year Built | Effective 2010 |
| Exterior Material | Combination Exterior |
| Construction Type | Masonry/Concrete Masonry Units (CMUs) Construction |
| Roof Material | Asphalt Roof |
| Lot Area | 14,478 sqft (0.332 acres) |
| Parking Spaces | 2 Parking Spaces |
| Garage Type | Detached Garage |
| Garage Area | 440 sqft Garage |
| Deck Area | 110 sqft Deck |
| Porch | Porch |
| Porch Area | 547 sqft Porch |
| Heating System | Hot Water Heating |
|---|
| Account Number | R0008239 |
|---|---|
| Street Address | 550 MAPLETON AVE |
| City | BOULDER |
| State | CO |
| Zip | 80304-3986 |
| Property Usage | Residential Property Usage |
| Type | Residential > Single Family > Home |
| Legal Description | LOTS 1-4 BLK 5 MAPLETON |
| Legal Range | 71 |
| Legal Township | 1N |
| Legal Section | 25 |
| Legal Subdivision | MAPLETON - BO |
| Legal Block | 5 |
| Legal Lot Number | 1 |
| Jurisdiction | BOULDER CO |
| Minor Civil Division | BOULDER |
| Census Blockgroup | 4 |
| Census Block | 4012 |
| Census Tract | 12101 |
Source: Boulder County records · APN 1461-25-4-08-001
Assessment roll updated June 15, 2026 · Last verified June 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 File |
|---|---|
| Mailing Address | 2525 ARAPAHOE AVE, E4, BOULDER, CO 80302-6746 |
| Owner Type | Owner is an Individual, Couple or Unincorporated Entity |
| Date | Document |
|---|---|
| Aug 21, 2023 | Deed of Trust, Mortgage MAPLETON SQ 4 LLC |
| Oct 26, 2021 | Special Warranty Deed, Transfer · Conventional Mortgage CITY NATIONAL BANK |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Known Transactions |
|
| Deed Doc Number | 20213923587 |
| Prior Transfer Date | Mar 10, 2011 |
| Prior Transfer Doc | 0003139767 |
| Record Refreshed | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | BOULDER CO |
| Property Address | 550 MAPLETON AVE, BOULDER, CO 80304-3986 |
| Transaction Type | Mortgage |
| Record Updated | Sep 14, 2023 |
| Name | Verified Name |
|---|---|
| Address | 2525 ARAPAHOE AVE E4-216, E4, BOULDER, CO 80302-6746 |
| Document Number | 0004018754 |
|---|---|
| Date | Aug 21, 2023 |
| Instrument | 4018754 |
| Name | MAPLETON SQ 4 LLC |
|---|---|
| Type | Non-Lending Institution |
| Amount | Amount Recorded |
|---|---|
| Term | 18 Months |
| Due | Feb 18, 2025 |
| Rate Type | Fixed Rate |
|---|---|
| Rate | 12% |
| Document Type | Special Warranty Deed |
|---|---|
| Jurisdiction | BOULDER CO |
| Recording Date | Oct 26, 2021 |
| Property Address | 550 MAPLETON AVE, BOULDER, CO 80304-3986 |
| Document Number | 0003923587 |
| Instrument Date | Oct 21, 2021 |
| Instrument | 3923587 |
| Transaction Type | Transfer |
| Record Updated | Nov 12, 2021 |
| Title Company | LAND TITLE GUARANTEE |
| Amount | Amount Recorded |
|---|---|
| Downpayment | Downpayment on File |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $450.00 |
| Amount Accuracy | Full Amount Stated |
| Additional |
|
| Name | Verified Name |
|---|---|
| Address | 550 MAPLETON AVE, 550, BOULDER, CO 80304-3986 |
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants |
| Address | 550 MAPLETON AVE, BOULDER, CO 80304-3986 |
| Document Number | 0003923588 |
|---|---|
| Date | Oct 26, 2021 |
| Instrument | 3923588 |
| Name | CITY NATIONAL BANK |
|---|---|
| Type | Bank |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Nov 01, 2051 |
| Rate Type | Adjustable Rate |
|---|---|
| Rate | 2.1% |
| Adjustable | Document includes a rider for adjustable-rate mortgage with a specific rate change date. |
| Type Change Date | Nov 01, 2031 |
| Change Frequency | Annually |
| Min Rate At Change | 2.75% |
| Max Rate At Change | 7.1% |
| Index | 1-Year CMT |
| Max Rate | 7.1% |
Source: Boulder County records · Assessment roll updated June 15, 2026 · Last verified June 2026
| Type | Name |
|---|---|
| State | Colorado |
| County | Boulder County |
| Municipality | Boulder City |
| Unified School District | Boulder Valley School District RE-2 (PK - 12) |
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.
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $367,941 (+8.8%) Land $160,922 Building $207,019 | $5,410,900 (-) Land $2,366,500 Building $3,044,400 | |
| 2025 | $32,245.00 (+25.4%) | $338,181 (+12.19%) Land $147,906 Building $190,275 | $5,410,900 (+20.27%) Land $2,366,500 Building $3,044,400 |
| 2023 | $25,713.00 (+0.45%) | $301,439 (+9.36%) Land $151,614 Building $149,825 | $4,499,100 (+13.44%) Land $2,262,900 Building $2,236,200 |
| 2022 | $25,598.00 | $275,651 Land $114,418 Building $161,233 | $3,966,200 Land $1,646,300 Building $2,319,900 |
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