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$690,840 Just Listed

  • For Sale
  • Active
  • Single Family
  • 3 Beds
  • 1 Full Bath
  • 1 Partial Bath
  • 780 Sq. Ft.
  • Updated 3 days ago
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PRIME OLDE TOWNE GAITHERSBURG - INVESTMENT & REDEVELOPMENT OPPORTUNITY! Excellent opportunity in the heart of Historic Olde Towne! Located at 403 E Diamond Ave, this two-story residential/commercial property features 3 bedrooms, 2 bathrooms, a den, living room, and approximately 6 parking spaces. Property requires complete renovation and is sold STRICTLY AS-IS. REDEVELOPMENT POTENTIAL! According to the seller, the Historic Preservation Board determined that the building is not historically protected and that demolition is at the owner's discretion, subject to applicable City requirements and permits. Prime location within walking distance of restaurants, shops, Olde Towne Plaza, and the MARC train station. The City has identified Olde Towne for revitalization and streetscape improvements, adding to the area's appeal. IMPORTANT: Buyer is responsible for all due diligence and must independently verify zoning, permitted residential/commercial uses, parking, Historic Preservation Board findings, demolition requirements, and redevelopment possibilities directly with the City of Gaithersburg. All uses and improvements are subject to required approvals. Information is deemed reliable but not guaranteed. PHOTO DISCLOSURE: Photos include a mix of actual property conditions and digitally enhanced renderings showing potential improvements such as painting, new windows, and lighting. Images are presented back-to-back for comparison. Renderings are illustrative only and do not reflect current conditions. BRING YOUR VISION AND EXPLORE THE POSSIBILITIES!

Full Property Details for 403 E Diamond Ave

General

  • Price: $690,840
  • Taxes: $9,409 (2026)
  • Status: Active
  • Type: Single Family
  • Source: BrightMLSMidAtlantic
  • MLS ID: MDMC2261366
  • Updated: 10/23/2026
  • Added to Site: 3 day(s) ago

Interior

  • Rooms/Areas: Living Room, Kitchen

Rooms

Bathrooms

  • Total Bathrooms: 2
  • Full Bathrooms: 1
  • Half Bathrooms: 1
  • Main Floor Baths: 2
  • Main - Full Baths: 1
  • Main - 1/2 Baths: 1

Bedrooms

  • Total Bedrooms: 3
  • Bedrooms Main & Up: 3

Exterior

  • Exterior Features: Other

Parking

  • Parking Features: Asphalt Driveway
  • Parking Type: Off Site, Parking Lot

Location

  • County: MONTGOMERY
  • Subdivision: DEER PARK
  • Driving Directions: From I-270, take Exit 9 toward I-370/Sam Eig Highway. Continue toward MD-355 North (Frederick Avenue). Turn right onto E Diamond Avenue (MD-117). Continue to 403 E Diamond Avenue. The property will be on your right.

School Information

  • School District: Montgomery County Public Schools

Community

  • Pets Allowed: Yes
  • Pets: No Pet Restrictions

Heating & Cooling

  • Cooling Type: Other
  • Cooling Fuel: Other
  • Heating Type: Other
  • Heating Fuel: Other
  • Water Heater: Other

Utilities

  • Sewer: Public Septic, Public Sewer
  • Water: Public

Structural Information

  • Architectural Style: Colonial
  • Structure Type: Detached
  • Construction: Other
  • Foundation: Other
  • Stories Description: Main
  • Square Feet: 780
  • Sq. Ft. Source: Estimated
  • Living Area: 780 Sq. Ft.
  • Finished Above Grnd: 780 Sq. Ft.
  • Year Built: 1899
  • Year Built Source: Assessor

Lot Features

  • Lot Size (Acres): 0.25
  • Lot Size (Sq. Ft.): 10,890
  • Lot Size Source: Assessor
  • Zoning: CBD

Financial Considerations

  • Price Per Sq. Ft.: $885.69
  • Assessment Year: 2026
  • City/TownTax: $1,664
  • City/TownTax Freq: Annually
  • County Tax: $6,564
  • County Tax Freq: Annually
  • Tax w/Assessment: $635,400
  • Tax Amount: $9,409
  • Tax Year: 2026
  • Tax Total Finished Sq. Ft.: 1872

Disclosures and Reports

  • Ownership: Fee Simple
  • Lot Number: 1

Listed by Sell Your Home Services, Daniel J. Demers

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Listing agent

— 403 E Diamond Ave —

  • Daniel J. Demers

    Sell Your Home Services

Get Pre-Approved Today

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Schools serving 403 E Diamond Ave

School District:Montgomery County Public Schools, Gaithersburg, MD
NameGradesDistance
Gaithersburg Elementary School
35 North Summit Avenue, Gaithersburg, MD 20877
PK-50.1 mi
Gaithersburg Middle School
2 Teachers Way, Gaithersburg, MD 20877
6-80.2 mi
Gaithersburg High School
101 Education Boulevard, Gaithersburg, MD 20877
9-120.6 mi
Disclaimer: School attendance boundaries provided by ATTOM Data Solutions and are for reference only. Contact the school directly to verify enrollment eligibility.

Price & Sales History for 403 E Diamond Ave Get Price Alerts and Save Property

Date
Details
Price
Change
Source
10/23/2026
Listed
$690,840
12.33%
MLS
3/16/2022
Sold
$615,000
—
Public Record
Get Price Alerts and Save Property
Disclaimer: Historical sales information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

Tax History for 403 E Diamond Ave

Year
Property Taxes
Change
Tax Assessment
Change
2025
$8,831
—
$635,400
7%
2025
$8,831
10%
$596,333
7%
2024
$8,051
10%
$557,267
8%
2022
$7,305
13%
$518,200
1%
2022
$6,487
3%
$515,000
1%
2018
$6,311
-9%
$511,800
1%
2021
$6,958
1%
$508,600
1%
2020
$6,895
1%
$502,233
1%
2019
$6,809
—
$495,867
1%
2018
$6,778
9%
$489,500
11%
2017
$6,227
15%
$442,500
12%
2016
$5,399
16%
$395,533
13%
2015
$4,640
-1%
$348,500
—
2014
$4,703
—
$348,500
—
View All
Disclaimer: Historical tax information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

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NMLS#: 1598647

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Listed by Sell Your Home Services, Daniel J. Demers

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403 E Diamond Avenue, Gaithersburg, MD 20877 (MLS# MDMC2261366) is a Single Family property with 3 bedrooms, 1 full bathroom and 1 partial bathroom. 403 E Diamond Avenue is currently listed for $690,840 and was received on October 23, 2026. Want to learn more about 403 E Diamond Avenue? Do you have questions about finding other Single Family real estate for sale in Gaithersburg? You can browse all Gaithersburg real estate or contact a Coldwell Banker agent to request more information.

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