509 W Montgomery Ave, Rockville — tax account 160403423566

Single-family house built in 2004, 3,304 ft² on 0.21 acres in Rockville, Montgomery County, assessed at $1,033,300; last transfer April 7, 2026 for $1,390,000.

From the State Department of Assessments and Taxation file as published by the Maryland Department of Planning (MD iMAP) — not the official record. Open the official SDAT record.

Account

Tax account number	160403423566
Map, grid, parcel	Map GR12 · Block 2 Lot 5
Location	509 W Montgomery Ave, Rockville MD 20850
Jurisdiction	Montgomery County
Subdivision	West End Park

Land

Land use	Residential (R)
Zoning	R60
Acreage	0.215 acres (9,365 ft²)

Structure

Year built	2004
Above-grade area	3,304 ft²
Style	2 Story With Basement
Building type	Standard Unit
Construction	Siding
Quality grade	6 (on a scale of 1 to 9)

Assessment — October 2024

Land	$364,600
Improvements	$668,700
Total	$1,033,300

Last transfer

Date	April 7, 2026
Consideration	$1,390,000
Deed reference	liber 51274, folio 0235

What this means

Maryland reassesses each property every three years; increases are phased in over the following three years, and the Homestead Tax Credit caps the yearly increase on a principal residence.
Assessed 66% above the median residential account in Montgomery County ($623,400, 248,486 accounts).
The last transfer price is 35% above the current assessment.

Parcel point of the Maryland Department of Planning — not a survey.

Data: Maryland Department of Planning / SDAT, MD iMAP Parcel Points, retrieved November 1, 2026. Sources and freshness. No owner names or mailing addresses are published.

First page of a sample Maryland Property Report

The report for account 160403423566

This page shows the assessment record. The report adds what lies around the property: FEMA flood zone, Critical Area designation, wetlands, contaminated land sites nearby and historic properties.

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