Remodeled Duplex with Guest
New
For Sale
$489,900
4105 18TH Avenue S, St Petersburg, FL 33711
Residential Income, ST PETERSBURG, FL
Property Size1,856 SF
Lot Size0.19 Acres
Price / SF$263.95
Days on Market3
Property Features for 4105 18TH Avenue S
General Information
Property type
Residential Multi Family
Property subtype
Duplex
Zoning
NTM-1
Bedrooms
4
Bathrooms
2
Full bathrooms
2
Rooms
Bedroom 1, Bedroom 3, Bedroom 4, Bathroom 2, Bedroom 2, Bathroom 1
Pets allowed
Yes
Interior features
Ceiling Fans(s)
Exterior features
Private Entrance
Appliances
Convection Oven, Dishwasher, Microwave, Range, Refrigerator
Subdivision
ST PETERSBURG INVESTMENT COS ADD TO OAK PARK
Lot features
Corner Lot, City Limits, Paved
Elementary school
Fairmount Park Elementary-PN
Middle school
Azalea Middle-PN
High school
Boca Ciega High-PN
Directions
From I-275, take Exit 19 for 22nd Avenue South and head west on 22nd Ave S. Turn right (north) onto 34th Street South (US-19), then turn left (west) onto 18th Avenue South. Continue west on 18th Ave S to 41st Street South. The property is on the corner of 18th Ave S and 41st St S, 4105 18th Ave S.
Standard status
Active
APN
27-31-16-78408-000-0090
Size
1,856 SF
Lot size
0.19 Acres
Taxes and HOA fees
Tax Year
2025
Tax Description
ST PETERSBURG INVESTMENT CO'S ADD TO OAK PARK LOT 9
Tax Annual Amount
6475
Legal Description
ST PETERSBURG INVESTMENT CO'S ADD TO OAK PARK LOT 9
Utilities
Sewer type
Public Sewer
Heating system
Electric (Heating)
Cooling system
Wall/Window Unit(s), Window Unit(s)
Water source
Public
Building Details
Year built
1922
Floors in Building
1
Number of units
2
Flooring type
Vinyl
Building materials
Frame
Roof type
Shingle
Listing Agency:
DALTON WADE INC
(888) 668-8283
Listed By:
Carissa White
(253) 293-4590
Added: Sep 17
Changed: Sep 19
Last Checked: Sep 19 at 9:06AM
MLS# TB8545709
Copyright © 2026 Stellar MLS. 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 duplex property comprises two separate residences on a 0.19-acre corner lot. The remodeled main home contains 3 bedrooms and 1 bath, while the detached cottage provides 1 bedroom and 1 bath with its own entrance. Together, the buildings offer 1,856 square feet, 4 bedrooms, and 2 baths. The main residence is vacant, and the cottage is leased. Interior features include vinyl flooring, ceiling fans, electric heat, window and wall-unit cooling, and a kitchen equipped with a convection oven, dishwasher, microwave, range, and refrigerator. The shingle roof was replaced in 2022 according to county permit records.
The property is located at 4105 18TH Avenue S in St. Petersburg, near the Skyway Marina District, downtown St. Petersburg, Gulf beaches, and I-275. It is zoned NTM-1, has public water and public sewer, no HOA, and is in FEMA Flood Zone X.
The property is located at 4105 18TH Avenue S in St. Petersburg, near the Skyway Marina District, downtown St. Petersburg, Gulf beaches, and I-275. It is zoned NTM-1, has public water and public sewer, no HOA, and is in FEMA Flood Zone X.
Key Highlights
- Two separate residences: a 3‑bedroom main home and detached 1‑bedroom cottage
- 1,856 square feet on a 0.19‑acre corner lot
- 4 bedrooms and 2 baths in total
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
$21,664
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
4.42%
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%
$433,280
$433.3K
Cap Rate 7%
$309,486
$309.5K
Cap Rate 9%
$240,711
$240.7K
Market Conditions
NOI Build-Up for 1,856 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
$33.2K $17.88/SF
− Vacancy
−$2.2K −$1.21/SF
EGI
$30.9K $16.67/SF
− OpEx
−$9.3K −$5.00/SF
NOI
$21.7K $11.67/SF
Area
Pinellas County, FL
Vacancy
6.74%
Lease Rate
$17.88 /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%
$433,280
Cap Rate 7%
$309,486
Cap Rate 9%
$240,711
Alternative Uses
Best Use
Multifamily LT 5
$309.5K
$270.8K – $361.1K
NOI $21,664 @ 7.0% cap · market cap 4.42%
Second Best
Apartment 5plus
$243.9K
$213.4K – $284.5K
NOI $17,070 @ 7.0% cap · market cap 3.48%
Theoretical Best
Office A
$482.8K
$422.4K – $563.2K
NOI $33,793 @ 7.0% cap · market cap 6.90%
Zoning and permitted uses should be independently verified with authorities.
Property Analytics
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Current Use
Lease Details
2
Residential units
Yes
Highway access
Yes
Paved road access
Location Intelligence
Trade Area within ½ mile
726
Businesses Nearby
Explore this area
Business Placement
Demographics for 33711, FL
20,121
Population
9,522
Households
2.1
Avg Household Size
41
Median Age
32%
College-Educated
96%
High-School Grad
4.7 sq mi
ZIP Area
4,281
Density / Sq Mi
$68,295
Median Household Income
$27,156
Median Earnings
$1,819
Median Rent
$253,100
Median Home Value
Check the figures for this property
Cap Rate, Value Estimation, Potential NOI and more
View Realmo Analytics
Market
Vacancy Rate% for Multifamily in South region
Questions? Ask Rey
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Frequently Asked Questions
What type of property is this?
Duplex - Two updated residences offer separate entrances, flexible living arrangements, and an existing lease on the detached cottage.
Where is this duplex located?
The property is located at 4105 18TH Avenue S St Petersburg, FL.
What is the asking price?
The asking price for this property is $489,900.
What are key features of this property?
This property features: Two separate residences: a 3‑bedroom main home and detached 1‑bedroom cottage; 1,856 square feet on a 0.19‑acre corner lot; 4 bedrooms and 2 baths in total
