409 E Diamond Ave, Gaithersburg, MD 20877 Property Records

Montgomery County property record for 409 E Diamond Ave, Gaithersburg, MD 20877

Property Summary

Property Type	Service Station (Full Service)
Details	1,651 sqft · built 1966
Lot Size	0.293 acres (12,775 sqft)
Owner	Company Name on Record
Last Sale	$2,100,000 (Aug 2023)
Tax Bill	$25,708 (2025)
Deeds & Mortgages	Aug 2023 Sale & Mortgage Nov 2019 Sale & Mortgage
Flood Zone	Zone X (minimal risk)
APN	`09-00821802`

Property Details

APN / Parcel Number

Primary APN	`09-00821802`
Alternative APN	`00821802`

Interior

Stories	1 Story
Building Area	1,651 sqft Gross Area
1st Floor Area	1,651 sqft

Exterior

Year Built	Built 1966
Effective Year Built	Effective 1966
Construction Type	Brick
Fire Resistance	Masonry Walls, Wood Interior
Lot Area	12,775 sqft (0.293 acres)
View / Lot	Commercial/Industrial
Shed	1 Shed
Shed Area	288 sqft

Utilities, Heating & Cooling

Cooling System	Central
Heating System	HVAC
Sewer	Municipal

Location & Zoning

Account Number	00821802
Street Address	409 E DIAMOND AVE
City	GAITHERSBURG
State	MD
Zip	20877-3019
Property Category	Commercial
Property Type	Commercial > Retail > Service Station (Full Service)
Local Zoning Code	CBD
Legal Description	DEER PARK
Legal Subdivision	GAITHERSBURG TOWN
Legal Block	1
Legal Lot Number	30
Jurisdiction	MONTGOMERY MD
Township / Civil Division	9
Census Block Group	1
Census Block	1004
Census Tract	700725

Owner

Source: Montgomery County records, as of August 17, 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 Record
Mailing Address	11020 ROSEMONT DR, ROCKVILLE, MD 20852-3651
Owner Type	Company
Vesting	Limited Liability Partnership

Deeds, Mortgages & Sale History

Date	Document
Aug 24, 2023	Deed, Transfer · Commercial Mortgage MAINSTREET BANK
Nov 5, 2019	Grant Deed, Transfer KENNETH L & CINDY J COHEN

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Aug 24, 2023 · Amount on Record
Deed Sale	Aug 24, 2023 · Amount on Record
Prior Sale	Nov 5, 2019 · Amount on Record
Deed Book / Page	67306 / 172
Record Updated	Sep 20, 2026

August 2023: Deed, Transfer

Document Type	Deed
Jurisdiction	MONTGOMERY MD
Recording Date	Aug 24, 2023
Property Address	409 E DIAMOND AVE, GAITHERSBURG, MD 20877-3019
Document Number	0673060172
Book / Page	67306 / 172
Instrument Date	Aug 17, 2023
Transaction Type	Transfer
Record Updated	Sep 8, 2023
Title Company	FIDELITY NATIONAL TITLE, FIDELITY NATIONAL TTL INS CO

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$10,500.00
Amount Accuracy	Full Amount Stated
Additional	Arm's Length Multiple Parcels

Transferred From (Grantor/Seller)

Name	Verified Name
Address	23709 WOODFIELD RD, GAITHERSBURG, MD 20882-2821

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	11020 ROSEMONT DR, NORTH BETHESDA, MD 20852-3651

Mortgage

Document Number	0673060180
Date	Aug 24, 2023
Instrument	67306/0180

Lender

Name	MAINSTREET BANK
Type	Bank

Agreement

Type	Commercial Mortgage
Amount	Amount Recorded

November 2019: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	MONTGOMERY MD
Recording Date	Nov 5, 2019
Property Address	409 E DIAMOND AVE, GAITHERSBURG, MD 20877-3019
Document Number	0584270006
Book / Page	058427 / 000006
Instrument Date	Jul 16, 2019
Transaction Type	Transfer
Record Updated	Nov 25, 2019
Title Company	ASPEN R/E SETTLEMENTS INC

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$1,400.00
Amount Accuracy	Confirmed
Additional	Arm's Length Multiple Parcels

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Company
Address	409 E DIAMOND AVE GAITHERSBURG MD 208773019, GAITHERSBURG, MD 20877-3019

Mortgage

Document Number	584270011
Date	Nov 5, 2019
Book Page	058427/000011

Lender

Name	KENNETH L & CINDY J COHEN

Agreement

Amount	Amount Recorded

Tax Assessment & Valuation

Source: Montgomery County assessment roll, as of August 17, 2026

Property Jurisdictions

Type	Name
State	Maryland
County	Montgomery County
Municipality	Gaithersburg City
Unified School District	Montgomery County Public Schools (PK - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$1,969,100 (+11.04%) Land $461,400 Building $1,507,700	$1,969,100 (-) Land $461,400 Building $1,507,700
2025	$25,708.00 (+33.33%)	$1,773,400 (+28.32%)	$1,969,100 (+42.48%) Land $461,400 Building $1,507,700
2023		$1,382,000 (-) Land $419,500 Building $962,500	$1,382,000 (-) Land $419,500 Building $962,500
2022	$19,282.00	$1,382,000 Land $419,500 Building $962,500	$1,382,000 Land $419,500 Building $962,500

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

Flood

Source: FEMA National Flood Hazard Layer, effective April 12, 2026

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it

Values are read at the parcel center point; lenders make the official flood determination.

Wildfire

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

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 cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water System	WASHINGTON SUBURBAN SANITARY COMMISSION serves 1,900,000 people · EPA ID MD0150005
Water Source	Surface water
Last State Inspection	May 2025
Lead	Under 1 ppb (2018–2020) action level 15 ppb

Violations Reported to EPA

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, not water tested at this address; lead at the tap also depends on the building's own pipes.

Internet Providers

Source: FCC Broadband Data Collection, based on 212 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Verizon Fiber · Fixed Wireless in parts of the area	2,300 / 2,300
Xfinity Cable	2,000 / 2,000
Astound Broadband Cable	1,500 / 50

May also be available: T-Mobile.

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