Updated Duplex with Central
For Sale
$775,000
285 A 66Th Street, Marathon, FL 33050
Residential, Marathon, FL
Property Size1,770 SF
Lot Size0.12 Acres
Price / SF$437.85
Days on Market12
Property Features for 285 A 66Th Street
General Information
Property type
Residential Multi Family
Property subtype
Duplex
Zoning
RM - Residential Medium
Bedrooms
4
Bathrooms
2
Full bathrooms
2
Rooms
Bathroom 1, Bedroom 3, Bathroom 2, Bedroom 4, Bedroom 1, Bedroom 2
Parking features
Open
Security features
Security
Pets allowed
Yes
Appliances
Washer, Dryer, Dishwasher, Refrigerator, Range, Oven, Microwave
Subdivision
Puerta Del Sol (50.5)
View
Water
Standard status
Active
APN
00341690-000000
Size
1,770 SF
Lot size
0.12 Acres
Taxes and HOA fees
Tax Year
2025
Tax Description
BK D LT 23 PUERTA DEL SOL PB3-117 KEY VACA
Tax Annual Amount
6573
Legal Description
BK D LT 23 PUERTA DEL SOL PB3-117 KEY VACA
Utilities
Utilities
Cable Available
Heating system
Central
Cooling system
Central Air
Building Details
Year built
1971
Flooring type
Tile
Building materials
CBS, Concrete
Roof type
Shingle
Listing Agency:
Florida Keys Real Estate Group
Listed By:
Brenner Scheel Casey · License #BK339103, BK3179545, SL3504409
(305) 783-3395
Added: Aug 27
Changed: Sep 5
Last Checked: Sep 7 at 1:06PM
MLS# 621145
Copyright © 2026 Marathon and Lower Keys Association of Realtors. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.
Investment Insights
Based on property information with market context.
This full duplex contains two living spaces within 1,770 square feet on a 0.12-acre lot. Both units have updated kitchens with cabinetry, countertops, and appliances, along with renovated bathrooms and replacement flooring. The property also includes upgraded electrical service, tile flooring, central heating, central air, open parking, and cable availability. Construction is CBS and concrete, with a shingle roof and a 1971 build date.
Located in Marathon, Florida, the property is zoned RM - Residential Medium. Included appliances are washers, dryers, dishwashers, refrigerators, ranges, ovens, and microwaves, providing a substantial existing equipment package for the duplex.
Located in Marathon, Florida, the property is zoned RM - Residential Medium. Included appliances are washers, dryers, dishwashers, refrigerators, ranges, ovens, and microwaves, providing a substantial existing equipment package for the duplex.
Key Highlights
- Full duplex with 1,770 square feet on a 0.12‑acre lot
- Both units have updated kitchens, renovated bathrooms, and replaced flooring
- Electrical system has been upgraded
Financial Insights
Estimated NOI and Cap Rate
NOI = area × lease_rate × (100 − vacancy) / 100 × (1 − expense_ratio). Net Operating Income — what the owner takes home each year before mortgage payments and income tax. Effective rent (asking rent minus vacancy losses) minus operating costs (taxes, insurance, maintenance, management).
NOI / Yr
$29,652
Cap rate = NOI / list price × 100. Capitalization rate — annual return on a fully cash purchase, before financing. NOI divided by price. Higher means more income per dollar invested, but usually also more risk or older condition. 5–8% is typical for stabilized commercial property; double digits often signal distressed deals.
Cap Rate
3.83%
Suggested Prices Based on Cap Rates
Cap rates vary significantly by property type, market, and asset quality.
Typical U.S. stable-market ranges:
Multifamily — 4.5% to 6.5% (Class A in primary markets often sub-5%; Class C in secondary markets 6%+)
Industrial / Logistics — 5.0% to 7.0% (compressed heavily in recent years due to e-commerce demand)
Office — 6.5% to 9%+ (wide spread post-2020; CBD Class A vs. suburban Class B varies dramatically)
Retail — 5.5% to 8.5% (grocery-anchored on the low end, unanchored strip centers higher)
Hospitality / Hotels — 7.5% to 10%+ (higher due to operational risk)
Self-Storage — 5.5% to 7.5%
Medical Office — 6.0% to 7.5%
Net Lease (single tenant, credit) — 5.0% to 7.0% depending on tenant credit and lease term
Rules of thumb:
Primary markets (NYC, SF, LA, Boston, DC) trade at lower cap rates than secondary/tertiary markets, often by 100–200 bps (bps, aka basis points; 1 bp = 0.01%).
Class A assets trade ~50–150 bps tighter than Class B, and Class B tighter than Class C.
Cap rates move inversely with price — a lower cap rate means a higher price for the same NOI.
Spread to the 10-year Treasury is a common benchmark; historically 200–400 bps over the 10-year.
Cap Rate 5%
$593,040
$593.0K
Cap Rate 7%
$423,600
$423.6K
Cap Rate 9%
$329,467
$329.5K
Market Conditions
NOI Build-Up for 1,770 SF
Vacancy — income lost from leasable area expected to sit empty during the year, subtracted from gross rent.
EGI (Effective Gross Income) — gross rent minus vacancy losses, the realistic income before paying operating costs.
OpEx (Operating Expenses) — recurring costs to operate the property (property tax, insurance, utilities, maintenance, management); excludes financing and capital improvements.
NOI (Net Operating Income) — income a property generates after operating costs but before financing and taxes.
Gross rent
$45.2K $25.56/SF
− Vacancy
−$2.9K −$1.63/SF
EGI
$42.4K $23.93/SF
− OpEx
−$12.7K −$7.18/SF
NOI
$29.7K $16.75/SF
Area
Monroe County, FL
Vacancy
6.37%
Lease Rate
$25.56 /SF/Yr
Expense Ratio
30.00%
Simulate Cap Rate and NOI
Suggested Prices Based on Cap Rates
Cap rates vary significantly by property type, market, and asset quality.
Typical U.S. stable-market ranges:
Multifamily — 4.5% to 6.5% (Class A in primary markets often sub-5%; Class C in secondary markets 6%+)
Industrial / Logistics — 5.0% to 7.0% (compressed heavily in recent years due to e-commerce demand)
Office — 6.5% to 9%+ (wide spread post-2020; CBD Class A vs. suburban Class B varies dramatically)
Retail — 5.5% to 8.5% (grocery-anchored on the low end, unanchored strip centers higher)
Hospitality / Hotels — 7.5% to 10%+ (higher due to operational risk)
Self-Storage — 5.5% to 7.5%
Medical Office — 6.0% to 7.5%
Net Lease (single tenant, credit) — 5.0% to 7.0% depending on tenant credit and lease term
Rules of thumb:
Primary markets (NYC, SF, LA, Boston, DC) trade at lower cap rates than secondary/tertiary markets, often by 100–200 bps (bps, aka basis points; 1 bp = 0.01%).
Class A assets trade ~50–150 bps tighter than Class B, and Class B tighter than Class C.
Cap rates move inversely with price — a lower cap rate means a higher price for the same NOI.
Spread to the 10-year Treasury is a common benchmark; historically 200–400 bps over the 10-year.
Cap Rate 5%
$593,040
Cap Rate 7%
$423,600
Cap Rate 9%
$329,467
Alternative Uses
Best Use
Multifamily LT 5
$423.6K
$370.7K – $494.2K
NOI $29,652 @ 7.0% cap · market cap 3.83%
Second Best
Apartment 5plus
$392.4K
$343.3K – $457.8K
NOI $27,466 @ 7.0% cap · market cap 3.54%
Theoretical Best
Office A
$712.0K
$623.0K – $830.6K
NOI $49,838 @ 7.0% cap · market cap 6.43%
Zoning and permitted uses should be independently verified with authorities.
Property Analytics
Property Profile
Current Use
Lease Details
2
Residential units
Location Intelligence
Trade Area within ½ mile
538
Businesses Nearby
Explore this area
Business Placement
Demographics for 33050, FL
10,479
Population
7,314
Households
1.4
Avg Household Size
50
Median Age
34%
College-Educated
90%
High-School Grad
9.1 sq mi
ZIP Area
1,152
Density / Sq Mi
$83,243
Median Household Income
$40,006
Median Earnings
$1,611
Median Rent
$705,600
Median Home Value
Market
Vacancy Rate% for Multifamily in South region
Questions? Ask Rey
Realmo’s AI knows this listing — price, zoning, demand, history. Ask anything.
Frequently Asked Questions
What type of property is this?
Duplex - Two separate living spaces feature renovated kitchens, bathrooms, flooring, and upgraded electrical systems.
Where is this duplex located?
The property is located at 285 A 66Th Street Marathon, FL.
What is the asking price?
The asking price for this property is $775,000.
What are key features of this property?
This property features: Full duplex with 1,770 square feet on a 0.12‑acre lot; Both units have updated kitchens, renovated bathrooms, and replaced flooring; Electrical system has been upgraded
