Active
4 beds3,080 sqft
321-331 9th St, Key Colony Beach, FL 33051
Est: $17,700/moGet pre-approved
Multi FamilyProperty Type
0.19 acresLot Size
1988Year Built
$1,039/sq ftPrice per sq ft

Description

Turn-Key Duplex on a Wide, Deep Canal - Key Colony BeachWelcome to one of the most sought-after settings in the Florida Keys -Key Colony Beach -- a private, tucked-away island community known for its quiet streets, boater-friendly waterways, and true Keys lifestyle. This full duplex sits on a impressively wide, clean, deep canal (100 ft across), offering easy access for boats of all sizes and some of the best water views in the neighborhood. Each side of the duplex mirrors the other in quality and...Turn-Key Duplex on a Wide, Deep Canal - Key Colony BeachWelcome to one of the most sought-after settings in the Florida Keys -Key Colony Beach -- a private, tucked-away island community known for its quiet streets, boater-friendly waterways, and true Keys lifestyle. This full duplex sits on a impressively wide, clean, deep canal (100 ft across), offering easy access for boats of all sizes and some of the best water views in the neighborhood. Each side of the duplex mirrors the other in quality and layout: upstairs you'll find 2 spacious bedrooms and 2 full baths, while downstairs offers a convenient pool bath plus a bonus game room/flex space with extra storage -- perfect for kayaks, fishing gear, or beach toys. Both units have been tastefully updated and fully furnished, right down to the dishes, pots, pans, and bedding. Just bring your suitcase. This property is as flexible as it is beautiful. Rent both sides for strong dual-income potential, create the ultimate family compound with room for everyone, or live in one side while renting the other for built-in income. However you use it, you're getting two turn-key homes in one of the safest, most tranquil pockets of the Florida Keys. Located just minutes from open water, world-class fishing, and the laid-back charm Key Colony Beach is known for -- this is Keys living at its most effortless. Two homes. One incredible canal. Endless possibilities. SELLING ONLY AS DUPLEX - will not split themContact Dawn McComish, P. A. -- The Singing Realtor(r) -- for a private showing.
29 days on Market
  • Listed by: Dawn M McComish • LPT Realty, LLC
Last updated: 08/20/2026 06:07 PM • Source: FKMLS, MLS#: 621036

Location

Listing Courtesy of LPT Realty, LLC
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Payment Calculator

$17,700 per month

30 year fixed, 6.71% Interest

Principal and Interest

$16,536

Property Taxes

$1,164

HOA Dues

$0

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Property Information for 321-331 9th Street

Property Details
  • Taxes: $13,969 / year
  • MLS Type: Residential / Single Family Residence
  • Waterfront: Canal Front
  • Waterfront: Yes
  • Zoning: R-2A - Key Colony Two Family
  • Subdivision: Key Colony Beach (53.5)
  • View: Canal
  • Vehicle Storage: Garage, Trailer Storage, RV Parking Open
  • Pets: Pets Allowed
Building Information
  • Year Built: 1988
  • Lot Size: 0.19 AC / 8,250 SF
Summary
Location and General Information
  • Waterview: Canal View
  • Area: 17 - Vaca Cut - Both Sides Holiday Inn/Key Colony
  • Absolute Longitude: 81.022462
  • Control Depth: 4
  • Listing Board: Marathon/Lower Keys
  • Side: Ocean
  • Mile Marker: 53.5
  • Marathon Neighborhood: Marathon East - Gulf (Airport to Vaca)
  • Neighborhood Feature: Tennis Courts, Bike Paths
  • Key/Island: Key Colony
Taxes and HOA Information
  • Association Info: Mandatory Home Owners Asc: No
  • Association Info: 1st Right of Refusal: No
  • License Info: # of City License: 2
  • Fee Includes: None
  • Furnished: Furnished
  • Tax Year: 2025
  • Tax Exemptions: Homestead, Disability
Property
Lot Information
  • SqFt Remarks: sq ftg for both sides of duplex
  • Parcel #: 00075560-000000
  • Add'l Parcel #1: 00075560-000100
  • Land Size: Less Than 1/4 Acre
Property and Assessments
  • Legal: KEY COLONY BEACH FIRST ADD AMENDED PLAT PB4-11 SHELTER KEY and N 1/2 LOT 12 BLK 10
  • MLS Approved: Y
  • Bank Owned: No
  • SqFt Source: Property Data Card
  • Rentals Allowed: Yes
  • Deed Restrictions: Unknown
  • Picture Count: 86
  • Document Count: 0
  • Building Style: Above Flood: Yes
  • Property Condition: Updated/Remodeled
  • Security: Patrolled Area
  • Title: Title Ins - Buyer
Utilities
  • Utilities: FKAA, Cable Available, Elect Separate Meter, Water Separate Meter, Buyer to Verify
  • Pub Sewer HkUp: Yes
  • Pool: Yes
  • Pool Info: In Ground, Decked, Fiberglass
Interior and Exterior Features
Interior Features
  • Floor: Tile, Laminate
  • Interior Features: Smoke Alarms
  • Pre-Wired: Cable
  • Appliances: Washer, Stainless Steel Appliance(s), Microwave, Oven, Refrigerator, Dishwasher, Dryer
Exterior Features
  • Roof: Metal Roof
  • Dockage: Dock Length: 75
  • Dockage: Dock: Composite
  • Dockage: Seawall: Concrete
  • Construction: CBS
  • Dockage: Boat Lift
  • Exterior Features: Storage
  • Windows/Doors: Impact Rstnce Window, Impact Rstnce Doors
Room Information
  • Specialty Rooms: Sun/Florida Room

Property History for 321-331 9th Street

DateEvent & SourcePriceAppreciation
Aug 20, 2026

Listed (Active)

Key West AOR #621036

$3,200,000
Aug 20, 2026

Listed (Active)

FKMLS #621036

$3,200,000
Aug 20, 2026

Listed (Active)

Marathon and Lower Keys AOR #621036

$3,200,000
DateEvent & SourcePrice
08/20/2026

Listed (Active)

Key West AOR #621036

$3,200,000
08/20/2026

Listed (Active)

FKMLS #621036

$3,200,000
08/20/2026

Listed (Active)

Marathon and Lower Keys AOR #621036

$3,200,000

For completeness, we often displays two records for one sale: the MLS record and the public record.

Schools near 321-331 9th Street

This home is within Monroe.
Rating
School
Type
Grades
Distance
Public - PK to 5
Public - 6 to 12
Public - 9 to 12
Charter - PK to 5
Rating
School
Distance
Stanley Switlik Elementary School
PublicPK to 5

Marathon School
Public6 to 12

Coral Shores High School
Public9 to 12

Big Pine Academy
CharterPK to 5

School ratings and boundaries are provided by GreatSchools.org and Pitney Bowes. This information should only be used as a reference. Proximity or boundaries shown here are not a guarantee of enrollment. Please reach out to schools directly to verify all information and enrollment eligibility.

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321-331 9th Street is a multi-family home for sale in Key Colony Beach, FL 33051. This property was listed for sale on August 20, 2026 by LPT Realty, LLC, it's currently listed at $3,200,000. This listing's school district is Monroe. Nearby schools include Stanley Switlik Elementary School, Marathon School and Coral Shores High School. 321-331 9th Street is a 4-bed, 6-bath, 3,080 sqft multi-family home built in 1988.

No guarantee, warranty or representation of any kind is made regarding the completeness or accuracy of any information, descriptions or measurements (including square footage measurements and property condition), such should be independently verified through appropriate means, including, but not limited to, in person inspection and public records, and Compass International Holdings, its subsidiaries, affiliates and independently owned and operated franchisees, and their affiliated agents and associated third parties expressly disclaim any liability in connection therewith. Photos may be virtually staged or digitally enhanced and may not reflect actual property conditions. Offers of compensation are subject to change at the seller's discretion. No financial or legal advice provided. Equal Housing Opportunity. Subject to change at any time. Compass, Inc., its subsidiaries, affiliates and their agents and associated third parties make no guarantee, warranty or representation regarding the accuracy of any waterfront feature, water view or waterfront view.

Listing Courtesy of LPT Realty, LLC

Based on information from one of the following Multiple Listing Services: Beaches Multiple Listing Service, Inc., Martin County REALTORS® of the Treasure Coast, Inc., Miami Association of REALTORS®. Information being provided is for the visitor’s personal, noncommercial use and may not be used for any purpose other than to identify prospective properties visitor may be interested in purchasing. The data contained herein is copyrighted by Beaches Multiple Listing Service, Inc., Martin County REALTORS® of the Treasure Coast, Inc., Miami Association of REALTORS® is protected by all applicable copyright laws. Any dissemination of this information is in violation of copyright laws and is strictly prohibited. Property information referenced on this web site comes from the Internet Data Exchange (IDX) program of the MLS. This web site may reference real estate listing(s) held by a brokerage firm other than the broker and/or agent who owns this web site. For the avoidance of doubt, the accuracy of all information, regardless of source, is deemed reliable but not guaranteed and should be personally verified through personal inspection by and/or with the appropriate professionals.