Leased Duplex with Central
For Sale
$315,000
521/523 Southtrail Drive, San Antonio, TX 78216
Multi-Family (2-8 Units), San Antonio, TX
Property Size1,793 SF
Lot Size0.17 Acres
Price / SF$175.68
Days on Market35
Property Features for 521/523 Southtrail Drive
General Information
Property type
Residential Multi Family
Property subtype
Other
Zoning
RM-4
Elementary school
Call District
Middle school
Call District
High school
Call District
Subdivision
0600
Standard status
Active
Size
1,793 SF
Lot size
0.17 Acres
Taxes and HOA fees
Tax Annual Amount
5555
Utilities
Cooling system
Central Air
Building Details
Year built
1968
Listing Agency:
Sophus Properties, LLC
(210) 850-2833
Listed By:
Donna Crabtree · License #512451
(210) 219-3045
Added: Aug 1
Changed: Aug 19
Last Checked: Sep 4 at 12:06PM
MLS# 1942351
Copyright © 2026 LERA 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 contains two residential units within a 1,793-square-foot property built in 1968. Both units are currently leased, providing existing occupancy at closing. Central air serves the property, and the improvements may benefit from cosmetic updates.
The property is located at 521/523 Southtrail Drive in San Antonio, Texas 78216. It sits on 0.174 acres and carries RM-4 zoning. The asset is classified as a duplex and is offered for sale.
The property is located at 521/523 Southtrail Drive in San Antonio, Texas 78216. It sits on 0.174 acres and carries RM-4 zoning. The asset is classified as a duplex and is offered for sale.
Key Highlights
- Two‑unit duplex with both units currently leased
- 1,793 square feet of property size
- 0.174‑acre lot
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
$20,638
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
6.55%
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%
$412,760
$412.8K
Cap Rate 7%
$294,829
$294.8K
Cap Rate 9%
$229,311
$229.3K
Market Conditions
NOI Build-Up for 1,793 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
$31.2K $17.40/SF
− Vacancy
−$1.7K −$0.96/SF
EGI
$29.5K $16.44/SF
− OpEx
−$8.8K −$4.93/SF
NOI
$20.6K $11.51/SF
Area
San Antonio, TX
Vacancy
5.50%
Lease Rate
$17.40 /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%
$412,760
Cap Rate 7%
$294,829
Cap Rate 9%
$229,311
Alternative Uses
Best Use
Multifamily LT 5
$294.8K
$258.0K – $344.0K
NOI $20,638 @ 7.0% cap · market cap 6.55%
Second Best
Apartment 5plus
$261.6K
$228.9K – $305.3K
NOI $18,315 @ 7.0% cap · market cap 5.81%
Theoretical Best
Office A
$457.4K
$400.2K – $533.6K
NOI $32,015 @ 7.0% cap · market cap 10.16%
Zoning and permitted uses should be independently verified with authorities.
Property Analytics
Property Profile
Current Use
Lease Details
2
Residential units
100%
Occupancy
Location Intelligence
Trade Area within ½ mile
1,699
Businesses Nearby
Explore this area
Business Placement
Demographics for 78216, TX
40,172
Population
22,138
Households
1.8
Avg Household Size
37
Median Age
34%
College-Educated
90%
High-School Grad
14.1 sq mi
ZIP Area
2,849
Density / Sq Mi
$55,488
Median Household Income
$38,591
Median Earnings
$1,211
Median Rent
$281,700
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 currently leased units offer an established occupancy profile in San Antonio.
Where is this duplex located?
The property is located at 521/523 Southtrail Drive San Antonio, TX.
What is the asking price?
The asking price for this property is $315,000.
What are key features of this property?
This property features: Two‑unit duplex with both units currently leased; 1,793 square feet of property size; 0.174‑acre lot
