6399 Union Ave
Firestone, CO 80504
4 bd 4 ba 2,909 sqft Built 2007 Lot 15,682 sqft single_family
No recorded sales
Location
Timeline: Sale, Listing & Tax History
Recorded events
No recorded events
No sale or listing events are on file for this property.
Tax assessment history
| Year | Building | Land | Total assessed | Tax paid |
|---|---|---|---|---|
| 2025 | $29,900 | $7,380 | $37,280 | $4,183 |
| 2024 | $29,900 | $7,380 | $37,280 | $3,709 |
| 2023 | $31,320 | $7,910 | $39,230 | $3,558 |
| 2022 | $24,910 | $5,210 | $30,120 | $3,150 |
| 2021 | $25,620 | $5,360 | $30,980 | $3,180 |
| 2020 | $25,610 | $4,290 | $29,900 | $3,045 |
| 2019 | $25,610 | $4,290 | $29,900 | $3,089 |
| 2018 | $22,390 | $4,320 | $26,710 | $2,659 |
| 2017 | $22,390 | $4,320 | $26,710 | $2,718 |
| 2016 | $20,610 | $4,460 | $25,070 | $2,593 |
| 2015 | $20,610 | $4,460 | $25,070 | $2,514 |
| 2014 | $15,510 | $1,910 | $17,420 | $1,745 |
| 2013 | $15,510 | $1,910 | $17,420 | $1,762 |
| 2011 | $15,800 | $3,580 | $19,380 | $1,843 |
| 2010 | $15,800 | $3,580 | $19,380 | $1,793 |
| 2009 | $15,380 | $3,580 | $18,960 | $1,598 |
| 2008 | — | $10,330 | $10,330 | $1,832 |
| 2007 | — | $10,330 | $10,330 | $907 |
Property facts
Year built
2007
Property type
single_family
Stories
2
Beds
4
Baths
4
Living area
2,909 sqft
Lot size
15,682 sqft
ZIP code
80504
City
Firestone
Street
Union Ave
Coordinates
40.16390, -104.93306
Comparable properties nearby
Block-level micro-comps
Same street, ±3 house numbers, sold in the last 24 monthsFrequently asked questions
When did 6399 Union Ave last sell?
No public-record sale is on file for 6399 Union Ave.
What is the current tax assessment for 6399 Union Ave?
The most recent total assessment for 6399 Union Ave (year 2025) is $37,280 with $4,183 in property tax.
When was 6399 Union Ave built?
6399 Union Ave was built in 2007.
How does 6399 Union Ave compare to others on Union Ave?
We track 8 other properties on Union Ave. Browse the list under "Other properties on Union Ave" to compare beds, baths, and sale history.
What are the property facts for 6399 Union Ave?
6399 Union Ave is a 4 bed, 4 bath, 2,909 sqft, 15,682 sqft lot single_family.
Is 6399 Union Ave a flip candidate?
No — 6399 Union Ave does not appear in our flips dataset.
Is 6399 Union Ave a tax-appeal candidate?
No — 6399 Union Ave is not currently flagged as a tax-appeal candidate.
Forecast for this area
ZIP-area linear projection — not a per-property automated valuationQuarterly trend
-32.1%
Implied 1-yr
-128.3%
2026 Q3
$537.5K
2026 Q4
$537.5K
ZIP 80504 — Median Price History + Forecast
Explore nearby
Geography
Other properties on Union Ave