Collin Value

221 St Mark Ln, Prosper, TX 75078

2,896 sqft, built 2015, in Tanner's Mill Phase 1C. Appraised at $699,004 for 2026.

Collin County account 2707082

Appraised value
$699,004
Tax year 2026
Living area
2,896 sqft
$241 per sqft
Year built
2015
Homestead
Yes
Owner-occupied exemption on file

Compare this assessment

Start with the county value and property facts, then review appraisal comps, recent sales, and prior-year changes to decide whether the assessment is worth challenging. The comps on this page are free to review; email sign-in is only used to save a printable report.

For nearby context, browse ZIP 75078, Tanner's Mill Phase 1C, Celina, and Prosper assessment pages.

Protest deadline

The 2026 protest deadline was . The 2027 protest deadline is . 2027 notices usually arrive in April.

Deadline rule: May 15, or 30 days after your notice of appraised value is mailed, whichever is later. A deadline on a weekend or holiday moves to the next business day. Evidence is reviewed by the Appraisal Review Board (ARB). Dates checked against the official source.

Assessment snapshot

These public CCAD records highlight what may be worth checking before you file.

  • Assessment changeThe appraised value decreased 1.4% from $708,801 in 2025 to $699,004 in 2026.
  • Appraised value per square footThe current public record shows about $241 per square foot before any comparable-property adjustments.
  • Nearby comparison areaThis page starts the equity review with public records for the Tanner's Mill Phase 1C neighborhood and ZIP 75078.
  • Neighborhood value signalAmong 304 residential records in the same neighborhood, the average appraised value is about $224 per square foot.
  • Area year-over-year signalNearby residential records with prior-year values moved about -1.5% on average.

Comparable assessments

Showing 5 of the 8 similar homes in this property's equity comparison, from public appraisal records.

  • 261 Kingsbury Ln, Prosper, TX 75078
    2,926 sqft | $242/sqft | built 2016 | Similar size (2,926 vs 2,896 sqft); Similar age (2016 vs 2015); Similar lot size (10,890 vs 10,890 sqft)
    $708,147
  • 200 Kingsbury Ln, Prosper, TX 75078
    2,902 sqft | $245/sqft | built 2018 | Similar size (2,902 vs 2,896 sqft); Similar age (2018 vs 2015); Similar lot size (10,890 vs 10,890 sqft)
    $710,587
  • 300 Andover Ln, Prosper, TX 75078
    2,934 sqft | $249/sqft | built 2018 | Similar size (2,934 vs 2,896 sqft); Similar age (2018 vs 2015); Similar lot size (10,878 vs 10,890 sqft)
    $731,994
  • 320 Godstone Ln, Prosper, TX 75078
    2,837 sqft | $247/sqft | built 2018 | Similar size (2,837 vs 2,896 sqft); Similar age (2018 vs 2015); Similar lot size (10,878 vs 10,890 sqft)
    $701,116
  • 260 Godstone Ln, Prosper, TX 75078
    2,822 sqft | $239/sqft | built 2019 | Similar size (2,822 vs 2,896 sqft); Similar age (2019 vs 2015); Similar lot size (10,878 vs 10,890 sqft)
    $675,287

Recent comparable sales

Sales selected by similarity to the subject property. Texas is a non-disclosure state, so these MLS-listed sales are supplemental evidence.

  • 1521 Brush Creek Rd, Prosper, TX 75078
    September-28-2026 | 2,770 sqft | $195/sqft | built 2012 | Similar size (2,770 sqft); Similar age (2012); Sold after the valuation date
    $539,000
  • 1618 Gardenia St, Prosper, TX 75078
    August-13-2026 | 2,976 sqft | $215/sqft | built 2018 | Similar size (2,976 sqft); Similar age (2018); Sold after the valuation date
    $639,900
  • 720 Hampshire Dr, Prosper, TX 75078
    September-1-2026 | 2,662 sqft | $253/sqft | built 2015 | 8% size difference (2,662 sqft); Similar age (2015); Sold after the valuation date
    $673,000
  • 1951 Harvard Ave, Prosper, TX 75078
    August-18-2026 | 3,066 sqft | $294/sqft | built 2019 | 6% size difference (3,066 sqft); Moderate age difference (4 years newer); Sold after the valuation date
    $899,900
  • 320 Fox Crossing Ln, Prosper, TX 75078
    August-13-2026 | 3,054 sqft | $221/sqft | built 2020 | 6% size difference (3,054 sqft); Moderate age difference (5 years newer); Sold after the valuation date
    $675,000

Public appraisal comparison for 2026. Prepared . Appraisal source: Collin Central Appraisal District. Sales data checked in this snapshot: . Matches consider available size, age, location and property characteristics. How comparisons work.

Value history

Down 1.4% in 2026 from 2025.

Appraised value by tax year, with the change from the previous year listed
Tax yearAppraised valueChangeChange %
2026$699,004−$9,797−1.4%
2025$708,801−$24,022−3.3%
2024$732,823+$22,859+3.2%
2023$709,964+$96,920+15.8%
2022$613,044+$184,464+43.0%
2021$428,580+$31,277+7.9%
2020$397,303——
6-year total+$301,701+75.9%