Montgomery County property record for 442 E Diamond Ave, Gaithersburg, MD 20877
| Property Type | Commercial Office |
|---|---|
| Details | 1,352 sqft · built 1856 |
| Lot Size | 0.166 acres (7,240 sqft) |
| Owner | Company Name on File |
| Last Sale | $350,000 (Jul 2013) |
| Tax Bill | $6,084 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 09-02711384 |
| Primary APN | 09-02711384 |
|---|---|
| Alternative APN |
|
| Stories | 2 Stories |
|---|---|
| Building Area | 1,352 sqft Gross Area |
| 1st Floor Area | 1,176 sqft |
| Basement Area | 176 sqft |
| Year Built | Built 1856 |
|---|---|
| Effective Year Built | Effective 1856 |
| Construction Type | Brick |
| Fire Resistance | Wood or Wood & Steel Frame |
| Lot Area | 7,240 sqft (0.166 acres) |
| View / Lot | Commercial/Industrial |
| Garage Type | Detached |
| Garage Area | 240 sqft |
| Parking Spaces | 1 Parking Space |
| Porch | Open Porch |
| Cooling System | A/C Chilled Water |
|---|---|
| Heating System | Hot Water |
| Sewer | Municipal |
| Account Number | 02711384 |
|---|---|
| Street Address | 442 E DIAMOND AVE |
| City | GAITHERSBURG |
| State | MD |
| Zip | 20877-3018 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Commercial Office |
| Local Zoning Code | CBD |
| Legal Description | HARRIS PROPERTY |
| Legal Subdivision | GAITHERSBURG TOWN |
| Legal Block | 1 |
| Legal Lot Number | 1 |
| Jurisdiction | MONTGOMERY MD |
| Township / Civil Division | 9 |
| Census Block Group | 1 |
| Census Block | 1003 |
| Census Tract | 700725 |
Source: Montgomery County records · APN 09-02711384
Assessment roll updated August 17, 2026 · Last verified August 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | 16109 AVERY RD, DERWOOD, MD 20855-1700 |
| Owner Type | Company |
| Vesting | Company |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Sale | Jul 12, 2013 · Amount on Record |
| Deed Sale | Jul 12, 2013 · Amount on Record |
| Prior Sale | Apr 17, 2003 · Amount on Record |
| Deed Book / Page | 47226 / 419 |
| Record Updated | Sep 20, 2026 |
Source: Montgomery County records · Assessment roll updated August 17, 2026 · Last verified August 2026
| Type | Name |
|---|---|
| State | Maryland |
| County | Montgomery County |
| Municipality | Gaithersburg City |
| Unified School District | Montgomery County Public Schools (PK - 12) |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $441,300 (+4.76%) Land $161,500 Building $279,800 | $441,300 (-) Land $161,500 Building $279,800 | |
| 2025 | $6,084.00 (+15.71%) | $421,233 (+10.53%) | $441,300 (+15.8%) Land $161,500 Building $279,800 |
| 2023 | $381,100 Land $146,900 Building $234,200 | $381,100 Land $146,900 Building $234,200 | |
| 2022 | $5,258.00 |
Source: FEMA National Flood Hazard Layer as of April 12, 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Wildfire Risk | Low lower than 98% of the US · lower than 96% of Maryland |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | None beyond ember reach |
Values are read at the parcel center point; lenders make the official flood determination.
Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026
| Provider | Max Down / Up (Mbps) |
|---|---|
| Verizon Fiber · Fixed Wireless in parts of the area | 2,300 / 2,300 |
| Xfinity Cable | 2,000 / 2,000 |
| Radiate Holdings Cable | 1,500 / 50 |
May also be available: T-Mobile USA.
Based on FCC filings for 212 locations within half a mile of this property.
Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | WASHINGTON SUBURBAN SANITARY COMMISSION serves 1,900,000 people |
|---|---|
| Water Source | Surface water |
| Last State Inspection | May 2025 |
| Lead | Under 1 ppb (2018–2020) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None last 3 years |
Results are for the whole water system as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.
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