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Property overview

809 William St

Baltimore, MD 21230

Who owns 809 William St, what the county and city have on record, and a measured sell-signal score — every fact dated and sourced.

Owner of recordWong, Jonathan and Tai, IreneMailing address: 0809 William St, 21230Observed Sep 20, 2026 · Baltimore City Real Property Information (Open Baltimore)
Parcel 0907 005 · Public research profile
Motivated Seller IndexDRAFT MODEL
73/100
About 7.5 in 100 homes with these signals sold within five months (2.6× the Baltimore rate)100% of model checks have usable evidence

A measured sell-signal score from public records: 3 positive signals observed. It is a base rate for homes like this, not a statement about this owner. How it works ↓

Satellite · © Google
Street View · © Google
Satellite · © Google
Assessed valueUnavailable
Tax statusUnverified
Ownership tenureUnverified
Property typeSemi-detached home (DHCD use 1007)

THE INDEX

Why this MSI reads 73

Draft model

4 of 18 checked public signals observed, covering 100% of the model. The score is public; the signal-by-signal reasons, source documents, and owner details are in LienSuite.

Method and limits. MSI v0.2-baltimore-2026-09 weights eighteen public signals by how much each one changed the recorded five-month arm’s-length transfer rate across all 180,000 residential parcels in Baltimore City, using only dated records (SDAT transfers, vacant-building notices, tax-sale lists, permits and 311 requests) so no signal reads the buyer’s state, checked on a holdout the model never saw (the top 0.5% of homes by score sold at 4.5x the citywide rate, the top 1% at 4.2x).: use / occupancy permit +24, vacant-building 311 request +17, alteration / rehab permit +14, building-permit 311 complaint +13, high grass and weeds 311 request +12, bought since 2024 +10, abandoned-vehicle 311 request +6, trade permit +5, sanitation / dumping 311 request +5, on the 2022 or 2023 tax-sale list +4, vacant building notice +3, demolition permit +3, exterior permit +2, structure-maintenance 311 request +2, permit valued at $25,000 or more -3, owned for 20 years or more -4, rodent 311 request -7, vacant building notice issued this year -11. The "in 100 homes" figure is the model's fitted probability for this combination of signals. It describes homes like this one in aggregate; it is not a claim about this owner's intentions, and it is not LienSuite's paid deal score.

THE RECORD

Property details

Dated sources
Property type
Semi-detached home (DHCD use 1007)
Observed Sep 20, 2026 · Baltimore City Real Property Information (Open Baltimore)
Owner of record
Wong, Jonathan and Tai, Irene (mailing address 0809 William St, 21230)
Observed Sep 20, 2026 · Baltimore City Real Property Information (Open Baltimore)
Homestead / principal residence
Owner-occupied principal residence (Permanent Home indicator H)
Observed Sep 20, 2026 · Baltimore City Real Property Information (Open Baltimore)
Vacant building notice
None open
Observed Sep 20, 2026 · DHCD vacant building notices (Open Baltimore)
Structure area
2,786 sq ft
Observed Sep 20, 2026 · Baltimore City Real Property Information (Open Baltimore)
Lot size
16-10X104
Observed Sep 20, 2026 · Baltimore City Real Property Information (Open Baltimore)
Year built
1900
Observed Sep 20, 2026 · Baltimore City Real Property Information (Open Baltimore)
Last recorded transfer
$685,000, private arms-length transfer, improved, April 28, 2026; 3 transfers on the SDAT record
Observed Sep 20, 2026 · Maryland SDAT Baltimore City real property assessments (opendata.maryland.gov)
Permits
1 DHCD permit in the last 12 months: replacing front windows and some rear windows. approved as per chap au (July 15, 2026)
Observed Sep 20, 2026 · DHCD housing and building permits (Open Baltimore)

Parcel reference: 0907 005. Facts reflect the listed observation dates and may have changed since then.

OWNERSHIP AND TAXES

Research snapshot

Observed tax balanceNot verified
Delinquency periodNot verified
Last recorded transferNot connected
Transfer amountNot connected

Source details not yet connected. A tax balance is not proof that a property is for sale.

CHANGES OVER TIME

Property timeline

  1. Permit

    Replacing front windows and some rear windows. Approved as per CHAP Authorization to Proceed. Replace eight windows at the 1st, 2nd, and 3rd floors with 6/6 double hung aluminum clad wood windows with Baltimore bullnose trim. Windows to fit the existing historic masonry openings with no additional framing or filler. Windows and window trim to be painted an off-white color to match existing. New windows to be Pella Reserve Series with exterior and interior simulated divided lites. At the rear elevation: Replace five windows at the rear ell�s 2nd floor with 1/1 double hung aluminum clad wood windows painted in an off-white color to match existing windows. Windows to fit the existing historic masonry openings with no additional framing or filler. All work to be completed as per information/plans/specs in CHAP files except where this ATP supersedes. Window Replacement.

    DHCD housing and building permits (Open Baltimore) · checked Sep 20, 2026
  2. Recorded transfer

    $685,000, private arms-length transfer, improved.

    Maryland SDAT Baltimore City real property assessments (opendata.maryland.gov) · checked Sep 20, 2026
  3. Recorded transfer

    $625,000, private arms-length transfer, improved.

    Maryland SDAT Baltimore City real property assessments (opendata.maryland.gov) · checked Sep 20, 2026
  4. Recorded transfer

    $629,000, private arms-length transfer, improved.

    Maryland SDAT Baltimore City real property assessments (opendata.maryland.gov) · checked Sep 20, 2026

NEARBY

More records nearby

Other homes on William St

All records on William St →

Highest sell signal in 21230

All of 21230, highest signal first →

Facts on this page reflect their observation dates. Confirm the parcel and current records with the county before acting.