Colorado Plaza Tower
Commercial-Office · Denver · 80293 · 621 17TH ST
At a glance
Colorado Plaza Tower (621 17TH ST) in Denver, CO is listed on the Denver property roll as “Commercial-Office”, schedule number 0234515031000. The roll records 418,846 sq ft of building area, 28 floors, a 1957 build year and an assessed value of $4,448,400. It last sold for $1,600,000 in Apr 2025 on a deed covering 2 parcels.
Recorded transfers — county roll + state sale file
Sale history
The most recent transfer covered 2 parcels. The price shown is the whole transaction, not this parcel alone, so any per-square-foot figure is measured across everything the deed conveyed. The county record carries no multi-parcel flag for it; the parcels were identified by their identical price, date and ZIP.
| Recorded | Price | Qualification | Source | Instrument |
|---|---|---|---|---|
| Apr 2025 | $1,600,000 | not rated | County roll | — |
Prices are the consideration recorded in Denver's public property records. Where a qualification code exists it is the assessor's judgement of whether a transfer was arm's length; transfers without one appear unrated rather than assumed clean. Whether a building is on the market today, and at what price, is not a public record and is not shown here — asking prices, listings and lease terms live in private commercial databases.
Denver assessment roll
Parcel record
| Field | Value |
|---|---|
| schedule number | 0234515031000 |
| Site address | 621 17TH ST |
| Land use (DOR) | 304 — Commercial-Office |
| Building area (actual) | 418,846 sq ft |
| Floors / units / buildings | 28 / — / — |
| Lot size | 36,612 sq ft |
| Year built | 1957 |
| Zoning (primary) | — |
| Land value | $4,447,400 |
| Building value | — |
| Total assessed value | $4,448,400 |
Recorded owner (assessment roll)
621 17TH LLC
Owner mailing address: 633 17TH ST STE 100, DENVER, CO, 80202
3 Denver office properties share this owner mailing address →
Commercial property is usually held one building per entity; a shared mailbox is how the roll reveals a portfolio. It is evidence of common ownership, not proof.
Location
- Address
- 621 17TH ST
- City
- Denver
- ZIP
- 80293
Within ~650 m
Nearby office buildings
No other office parcels within ~650 m.
How does Colorado Plaza Tower compare with other Denver office buildings?
At 418,846 sq ft, Colorado Plaza Tower is about 8 times the size of the average office building on the Denver roll, which comes to 51,722 sq ft across 2,022 buildings.
With 28 floors it is one of 112 office buildings of ten or more floors in the metro.
Its assessed value works out to $11 per square foot of building area, against $207 across all office floor area on the roll.
The last recorded sale priced it at $3 per square foot across the parcels conveyed.
Does the owner of Colorado Plaza Tower hold other Denver office property?
3 Denver office properties (3 parcels, 1.1M sq ft) are recorded to 2 owner entities sharing this parcel's tax-bill mailing address. A shared mailing address is evidence of common ownership, not proof of it.
What has happened at Colorado Plaza Tower recently?
1 recorded transfer is on file for this parcel, the latest dated Apr 2025.
What does “Commercial-Office” mean for this parcel?
The Denver roll classifies schedule number 0234515031000 as “Commercial-Office” (use code 304). BuildingCensus includes a parcel in its office census when the roll gives it an office-class use, so the label is the county's, not an inference.
Frequently asked questions
Who owns Colorado Plaza Tower?
The recorded owner on the Denver assessment roll (current) is 621 17TH LLC. Owner mailing address on file: 633 17TH ST STE 100, DENVER, CO, 80202.
How big is Colorado Plaza Tower?
The Denver roll records 418,846 sq ft of building area, 28 floors, a build year of 1957. It sits on a 36,612 sq ft lot.
What is the assessed value of Colorado Plaza Tower?
$4,448,400 on the Denver roll. Assessed values are taxable-roll figures, not market prices.
When did Colorado Plaza Tower last sell?
The last recorded transfer was in Apr 2025 for $1,600,000, on one deed conveying 2 parcels ($3 per square foot).
What is the schedule number for Colorado Plaza Tower?
Schedule number 0234515031000, site address 621 17TH ST, Denver. It is the key to look the parcel up in the City and County of Denver open-data parcels (Denver).
More around Colorado Plaza Tower
Everything here comes from public records, and public records go stale. If you know better, say so.
Data provenance — public records only
- Denver — City and County of Denver open-data parcels (owner names, mailing addresses, office classes, commercial areas), the recorded sales and transfers table with prices and counterparties, and Energize Denver benchmarking. The city's licence roll covers regulated trades only and carries no premises addresses, so no tenant layer is possible.
Every fact on this page is drawn from the government records above — no listing sites, no scraped platforms, no third-party images. Facts from public records are uncopyrightable; each tenancy row carries its source and match confidence. Records can lag reality — a business-tax receipt or registration at an address is evidence of occupancy, not a lease confirmation.
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Dataset updated . Source: Denver assessment roll, schedule number 0234515031000.
About this data
Source: City and County of Denver open-data parcels (Denver), as published September 20, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Colorado Plaza Tower, Denver, CO (schedule number 0234515031000)”, https://buildingcensus.com/offices/denver/colorado-plaza-tower-e206db71 (data as of September 20, 2026).