300 E Osborn Rd, Phoenix, AZ 85012

Office · Phoenix · Phoenix metro, AZ

One of 3,438 reachable office buildings in Phoenix. Larger than 77% of office buildings in Phoenix (median 7,437 SF), derived from assessor records.

County gross building area
20,424 SF, Maricopa County Assessor
Lot size
52,734 SF, Maricopa County Assessor
Year built
1985, Maricopa County Assessor
Stories
2, Maricopa County Assessor
Predominant use
Office Building 2 Story, Maricopa County Assessor
Assessed value
$4,556,617, per the Maricopa County Assessor (not a market appraisal)
Assessed value per building SF
$223.10/SF, derived from assessor records
Building area / lot
0.39, derived from assessor records
Vintage
1980s vintage
County use code
OFFICE BUILDING 2 STORY

Nearby comparable buildings

Same building type, by distance. Assessor facts only; not an opinion of value.

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Sale history and market context

MakeMe Estimate: $5.09M (estimated market value), with a likely range of $4.07M to $6.04M (half of recent verified sales in this segment landed inside that range). Computed as the county's full cash value of $4,556,617 times a 1.12 market ratio, measured from 3891 verified arm's-length sale prices vs county values (office sales in Phoenix, through 2026-06-29). Not an appraisal. How this estimate works.

lower confidence: 26 comparable sales within 3 miles; nearest 0.6 mi. This property type carries wider measured error; treat the estimate as a starting point. Comparable-sale caveat: the estimate is well above (more than double apart from) the $86.72/SF median of the shown comparable sales.

Comparable sales used as evidence

Recorded arm's-length sales of similar buildings nearby; nearer and more recent sales rank first. The strongest 5 of 26 nearby verified sales are shown. Buyer and seller names are withheld. Get this data via API.

Market context: Office in Phoenix

median verified sale $217.33/SF over the trailing 24 months; 111 sales in the last 12 months and 225 in 24 (newest verified sale 2026-05); the middle 80% of recent sales traded at 0.73x to 1.73x their county full cash value, median 1.16x (224 sales with usable county values).

  • 2022: $166.43/SF median (93 sales)
  • 2023: $175/SF median (78 sales)
  • 2024: $220.98/SF median (105 sales)
  • 2025: $223.09/SF median (128 sales)
  • 2026 YTD: $192.75/SF median (25 sales)

This estimate sits at 1.12x county full cash value, the 45th percentile of those recent sale premiums.

Computed from 1,330 verified arm's-length sales in Maricopa County public records (225 in the trailing 24 months). Free public records. Not an appraisal.

Current ownership dates to 2019 (about 7 years) per recorded transfers.

Source: Maricopa County recorded sales extract; buyer and seller shown only when a company or organization. Individual names are withheld.

Value over time

$0$2M$4M$6M$8M20262027$5.09M$4.56MCounty assessed valueMakeMe Estimate range

Dark line: county assessed value per Maricopa County tax rolls. Blue line: our estimate; dashed years are a modeled backcast built from recorded arm's-length sales in the building's segment, not estimates published at the time, and years without enough sales stay unmodeled. The shaded range is the model's measured error band; about half of verified sales in the segment land inside it. Not an appraisal. How this estimate works.

Land, site, and value history

Assessed value moved from $5,113,615 (2026) to $4,556,618 (2027), down 11% over 1 years, per county tax rolls. The 2027 roll splits $4,556,618 into $3,164,025 land and $1,392,591 improvements.