21 Desellum Avenue
Gaithersburg, MD 20877
- 3 beds
- 2 baths
- 2,024 sqft
- ~1/2 acre lot
- $271 per sqft
- 1955 build
A solid brick rambler with walkout lower level, sitting on a .49 ac. lot. Enclosed sunroom adds so much to the living area which opens onto a beautiful large deck with stairs down to the gazebo and large nature lover's lot. The detached garage has not been used as a garage in years, but could be. It has a floored 2nd level with great storage! Spacious kitchen opening to both the Sunroom and separate Dining Rm. Hardwood floors are in the Living Rm, Dining Rm and Bedrooms. Main floor Bathrm. has tub and shower. The lower level is great for entertaining with a spacious Family Rm and fireplace, 2nd full bath and additional BR. There is an enclosed room making a perfect space for starting those spring seeds and flowers.
Last checked:
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Last updated Mar 29, 2025
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MLS# MDMC2170258 —
The Building
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Year Built:1955
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Year Built Source:Assessor
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New Construction:No
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Construction Materials:Brick
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Structure Type:Detached
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Historic:No
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Architectural Style:Ranch/Rambler
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Levels:2
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Accessibility Features:None
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Foundation Details:Concrete Perimeter, Other
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Basement:Yes
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Basement Type:Full, Fully Finished, Improved, Walkout Level
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Total SqFt Source:Estimated
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Total Below Grade SqFt:1324
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Total Below Grade SqFt Source:Estimated
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Above Grade Finished Area Units:Square Feet
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Above Grade Finished SqFt:1324
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Above Grade Finished SqFt Source:Estimated
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Below Grade Finished Area Units:Square Feet
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Below Grade Unfinished Area Units:Square Feet
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Below Grade Finished SqFt Source:Assessor
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Below Grade Finished SqFt:700
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Below Grade Unfinished SqFt:624
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Below Grade Unfinished SqFt Source:Estimated
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Tax Total Finished SqFt:1974
Interior
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Interior Features:Kitchen - Eat-In, Kitchen - Country, Kitchen - Table Space, Floor Plan - Traditional, Formal/Separate Dining Room
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Room List:Living Room, Dining Room, Bedroom 2, Kitchen, Family Room, Bedroom 1, Sun/Florida Room, Bathroom 1, Bathroom 2
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Fireplace:Yes
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Fireplaces:2
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Living Area SqFt Source:Estimated
Room Dimensions
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Total SqFt:2648
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Living Area SqFt:2,024 Sqft
Financial & Terms
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Sale Type:Standard
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Possession:Settlement
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Lease Considered:No
Location
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Directions:Rt 355 to So on Cedar Ave, left on George St, left on De Sellum to #21.
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Latitude:39.13717522
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Longitude:-77.19643488
The Property
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Property Type:Residential
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Lot Size Units:Square Feet
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Lot Size Acres:0.49
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Lot Size Source:Assessor
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Lot SqFt:21,342 Sqft
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Zoning:R90
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In City Limits:Yes
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Outdoor Living Structures:Deck(s)
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Other Structures:Above Grade, Below Grade
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Waterview:No
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Waterfront:No
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Water Oriented:No
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Water Access:No
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Navigable Water:No
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Tidal Water:No
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Land Use Code:R
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Ground Rent Exists:No
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Riparian Rights:No
Listing Agent
- Contact info:
- Agent phone:
- (301) 529-5200
- Office phone:
- (301) 251-1221
Taxes
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Tax ID Number:160900821870
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Tax Year:2024
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Tax Annual Amount:$5,392
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Tax Assessed Value:$381,233
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Year Assessed:2024
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County Tax:3963.00
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City/Town Tax:998.00
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Total Taxes Payment Frequency:Annually
Beds
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Bedrooms:3
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Bedrooms Main Level:2
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Lower Level Bedrooms:1
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Lower Level Bedrooms:1
Baths
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Total Baths:2
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Full Baths:2
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Main Level Baths:1.00
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Main Level Full Baths:1
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Lower Level Full Baths:1
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All Lower Levels Total Baths:1
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Lower Level Total Baths:1.00
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Lower Level Full Baths:1
Heating & Cooling
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Cooling Type:Central A/C
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Central Air:Yes
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Cooling Fuel:Electric
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Heating:Yes
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Heating Type:90% Forced Air
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Heating Fuel:Natural Gas
Utilities
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Sewer/Septic:Public Sewer
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Hot Water:Natural Gas
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Water Source:Public
Appliances
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Appliances:Dishwasher, Extra Refrigerator/Freezer, Oven/Range - Gas, Refrigerator
Schools
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School District Name:Montgomery County Public Schools
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School District Source:Listing Agent
The Community
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Subdivision Name:Summit Hall Reserve
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Senior Community:No
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Exterior Features:Other
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Pool:No Pool
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HOA:No
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Condo/Coop Association:No
Parking
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Total Garage and Parking Spaces:3
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Garage:Yes
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Garage Features:Additional Storage Area, Oversized
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Garage Spaces:1.00
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Type of Parking:Driveway, Detached Garage
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# of Detached Garage Spaces:1
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Driveway - # of Spaces:2
Extra Units
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Vacation Rental:No
Monthly cost estimate

Asking price
$550,000
Expense | Monthly cost |
---|---|
Mortgage
This calculator is intended for planning and education purposes only. It relies on assumptions and information provided by you regarding your goals, expectations and financial situation, and should not be used as your sole source of information. The output of the tool is not a loan offer or solicitation, nor is it financial or legal advice. |
$2,945
|
Taxes | $449 |
Insurance | $151 |
Utilities | $214 See report |
Total | $3,759/mo.* |
*This is an estimate |
Walk Score®
Provided by WalkScore® Inc.
Walk Score is the most well-known measure of walkability for any address. It is based on the distance to a variety of nearby services and pedestrian friendliness. Walk Scores range from 0 (Car-Dependent) to 100 (Walker’s Paradise).
Bike Score®
Provided by WalkScore® Inc.
Bike Score evaluates a location's bikeability. It is calculated by measuring bike infrastructure, hills, destinations and road connectivity, and the number of bike commuters. Bike Scores range from 0 (Somewhat Bikeable) to 100 (Biker’s Paradise).
Transit Score®
Provided by WalkScore® Inc.
Transit Score measures a location's access to public transit. It is based on nearby transit routes frequency, type of route (bus, rail, etc.), and distance to the nearest stop on the route. Transit Scores range from 0 (Minimal Transit) to 100 (Rider’s Paradise).
Soundscore™
Provided by HowLoud
Soundscore is an overall score that accounts for traffic, airport activity, and local sources. A Soundscore rating is a number between 50 (very loud) and 100 (very quiet).
Air Pollution Index
Provided by ClearlyEnergy
The air pollution index is calculated by county or urban area using the past three years data. The index ranks the county or urban area on a scale of 0 (best) - 100 (worst) across the United Sates.
Sale history
Date | Event | Source | Price | % Change |
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3/29/25
Mar 29, 2025
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Sold Subject To Contingencies | BRIGHT | $550,000 | |
3/28/25
Mar 28, 2025
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Listed / Active | BRIGHT | $550,000 |

48% of nearby similar homes sold for over asking price
Similar homes that sold in bidding wars went $26k above asking price on average, but some went as high as $104k over asking price.