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Renovated Two-Unit Duplex

3735 Mainer Street, Houston, TX 77021

For Sale
$455,000

Two three-bedroom residences feature open layouts, updated building systems, and quartz countertops.

Property Size2,280 SF
Price / SF$199.56
Days on Market210

Property Features for 3735 Mainer Street

General Information

Standard status Active
Size 2,280 SF
Property subtype Multi Family,Duplex

Site & Location

Neighborhood Greater Ost / South Union

Units

Unit Mix 2 x 3BR/2BA
Multifamily Units 2

Taxes and HOA fees

Annual Taxes $5,866

Building Details

Building Size 2,280 SF
Year Built 1970
Buildings 1
Listing Agency: Keller Williams Realty Southwest
Listed By: Wykila Green
Source: Skwrealty
Added: Apr 15 Changed: Nov 8 Last Checked: Nov 10 at 7:50PM

Displayed information is deemed reliable but is not guaranteed and should be independently verified. All listing content including descriptions, pricing, images are the copyrighted material of Keller Williams Realty Southwest

Rey
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Investment Insights

Based on property information with market context.

This duplex contains two residences, each with three bedrooms, two bathrooms, and 1,100 square feet of open-plan living space. A 600-square-foot expansion is part of the property. Interior finishes include quartz countertops and luxury vinyl plank flooring, while updates to the PEX plumbing, electrical, and HVAC systems provide modernized building infrastructure. The property was built in 1970.

The duplex is 2 miles from NRG Stadium and 3 miles from the Medical Center. Its configuration combines two separate residential units within one property.

Key Highlights

  • Two units, each with 3 bedrooms and 2 bathrooms
  • Each residence offers 1,100 square feet of open‑concept living
  • 600‑square‑foot expansion

Financial Insights

Estimated NOI and Cap Rate

NOI / Yr
$29,863
Cap Rate
6.56%
Suggested Prices Based on Cap Rates
Cap Rate 5%
$597,260 $597.3K
Cap Rate 7%
$426,614 $426.6K
Cap Rate 9%
$331,811 $331.8K
Market Conditions
NOI Build-Up for 2,280 SF
Gross rent
$45.1K $19.80/SF
− Vacancy
−$2.5K −$1.09/SF
EGI
$42.7K $18.71/SF
− OpEx
−$12.8K −$5.61/SF
NOI
$29.9K $13.10/SF
Area
Houston, TX
Vacancy
5.50%
Lease Rate
$19.80 /SF/Yr
Expense Ratio
30.00%
Simulate Cap Rate and NOI
Suggested Prices Based on Cap Rates
Cap Rate 5%
$597,260
Cap Rate 7%
$426,614
Cap Rate 9%
$331,811

Alternative Uses

Best Use
Multifamily LT 5
$426.6K
$373.3K – $497.7K (±1% cap)
NOI $29,863 @ 7.0% cap · market cap 6.56%
Second Best
Apartment 5plus
$369.0K
$322.9K – $430.5K (±1% cap)
NOI $25,830 @ 7.0% cap · market cap 5.68%
Theoretical Best
Office A
$586.3K
$513.0K – $684.0K (±1% cap)
NOI $41,040 @ 7.0% cap · market cap 9.02%
Zoning and permitted uses should be independently verified with authorities. How Realmo checks its estimates

Property Analytics

Who owns this building? See the owner, sales and loan history
Open Analytics

Lease Details

2
Residential units

Location Intelligence

Trade Area within ½ mile

372
Businesses Nearby

Demographics for 77021, TX

28,055
Population
12,819
Households
2.2
Avg Household Size
36
Median Age
34%
College-Educated
87%
High-School Grad
6.1 sq mi
ZIP Area
4,599
Density / Sq Mi
$45,034
Median Household Income
$38,041
Median Earnings
$1,193
Median Rent
$203,900
Median Home Value
Check the figures for this property Cap Rate, Value Estimation, Potential NOI and more
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Market

Average Price Trend$/SF for Duplexes in Houston, TX

$199 Jul
$190 Aug
$184 Sep
$186 Oct

Properties on Market for Duplexes in Houston

Jul
Aug
Sep
Oct

Vacancy Rate% for Multifamily in South region

8.5% 2022
10.2% 2023
11.4% 2024
11.3% 2025

Frequently Asked Questions

What type of property is this?
Duplex - Two three-bedroom residences feature open layouts, updated building systems, and quartz countertops.
Where is this duplex located?
The property is located at 3735 Mainer Street Houston, TX.
What is the asking price?
The asking price for this property is $455,000.
What are key features of this property?
This property features: Two units, each with 3 bedrooms and 2 bathrooms; Each residence offers 1,100 square feet of open‑concept living; 600‑square‑foot expansion
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