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3400 Prospect St NW #10, Washington, DC 20007
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3400 Prospect St NW #10, Washington, DC 20007
3400 Prospect St NW #10, Washington, DC 20007

3400 Prospect St NW #10 Washington, DC 20007

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0Saves

$28,000,000

CLOSED
Beds
5
Baths
9
Sqft
30,000
Acres
0.51
Year
1787
Close Date
Jan 12, 2026
Property Type
Residential
Sub Type
Per Square Foot
$933
Date Listed
Oct 13, 2026

Description of 3400 Prospect St NW #10, Washington, DC 20007

Listing details for 3400 Prospect St NW #10, Washington, DC 20007 : Extraordinary Halcyon House! Over 30,000 square feet in this historically designated mansion overlooking the Potomac River. Sited on a dominant 1/2-acre hill. Once owned and expanded by Mark Twain's nephew. Masterful restoration-pristine condition. Most appropriate for either a single family or a qualified non-profit group. *REGISTRATION FORM REQUIRED
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Listing Updated : 10-13-2026 at 11:45 AM EDT
Listing Provided By : Mark D McFadden, 7032161333, [email protected], Compass

Properties displayed may be listed or sold by various participants in the MLS

Source :

Bright MLS, MLS#: DCDC2287620

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What's this home worth?

National portals guess with an algorithm. We price it from actual closed sales on your street.

Your home value estimate
$20.28M – $33.80M
Exact number$2,845,000

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What's this home worth?

National portals guess with an algorithm. We price it from actual closed sales on your street.

Your home value estimate
$20.28M – $33.80M
Exact number$2,845,000

Want an exact number? Use an Agent, not an algorithm.

Is this your home?

Claim it to unlock a private owner dashboard, track your equity, and get a free monthly value report.

Property History

DateEventPrice
10/13/2026
Listed for sale
—
Source:Bright MLS #DCDC2287620
1/12/2026
Sold
$28,000,000
$933/sqft
Source:Bright MLS #DCDC2287620

Location of 3400 Prospect St NW #10, Washington, DC 20007

Streetview of 3400 Prospect St NW #10, Washington, DC 20007

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What's this home worth?

National portals guess with an algorithm. We price it from actual closed sales on your street.

Your home value estimate
$20.28M – $33.80M
Exact number$2,845,000

Want an exact number? Use an Agent, not an algorithm.

Is this your home?

Claim it to unlock a private owner dashboard, track your equity, and get a free monthly value report.

Comments

Ctrl + Enter to send

No comments yet. Add the first note about this listing.

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The data relating to real estate for sale on this website appears in part through the BRIGHT Internet Data Exchange program, a voluntary cooperative exchange of property listing data between licensed real estate brokerage firms, and is provided by BRIGHT through a licensing agreement. Listing information is from various brokers who participate in the Bright MLS IDX program and not all listings may be visible on the site. The property information being provided on or through the website is for the personal, non-commercial use of consumers and such information may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Some properties which appear for sale on the website may no longer be available because they are for instance, under contract, sold or are no longer being offered for sale. Property information displayed is deemed reliable but is not guaranteed. Copyright 2026 Bright MLS, Inc.
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