Detached Duplex With
New
For Sale
$899,999
513 Williamson Ave, Fullerton, CA 92832
Residential Income, Traditional, Fullerton, CA
Property Size2,050 SF
Lot Size0.18 Acres
Price / SF$439.02
Days on Market2
Property Features for 513 Williamson Ave
General Information
Property type
Residential Multi Family
Property subtype
Other
Bedrooms
5
Bathrooms
3
Full bathrooms
3
Rooms
Bedroom 4, Bathroom 1, Bedroom 3, Bedroom 5, Bathroom 2, Bedroom 2, Bathroom 3, Bedroom 1
Parking
4
Parking features
Garage, Driveway
Directions
Waze.com
Subdivision
Fullerton
Standard status
Active
APN
032-082-17
Size
2,050 SF
Lot size
0.18 Acres
Utilities
Heating system
Electric (Heating)
Cooling system
Window Unit(s)
Building Details
Floors in Building
1
Number of units
2
Architectural style
Other
Listing Agency:
eXp Realty of California Inc
(888) 584-9427
Listed By:
Carlos Villegas · License #01775788
(661) 619-7335
Added: Aug 24
Last Checked: Aug 25 at 12:06AM
MLS# 26875315
Copyright © 2026 The MLS/CLAW. 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 consists of two detached homes on a 0.1758-acre lot, with 2,050 square feet of combined property size. The larger residence includes 3 bedrooms, 2 bathrooms, and a 2-car garage. The second home provides 2 bedrooms, 1 bathroom, and a detached 1-car garage. Driveway parking is also included.
Both residences are currently tenant occupied. Gas and electricity are separately metered for each unit, with tenants responsible for their respective utility usage. The property is located near Downtown Fullerton restaurants and entertainment, along with Costco, theaters, shopping, and other major conveniences. Heating is electric, and cooling is provided by window units.
Both residences are currently tenant occupied. Gas and electricity are separately metered for each unit, with tenants responsible for their respective utility usage. The property is located near Downtown Fullerton restaurants and entertainment, along with Costco, theaters, shopping, and other major conveniences. Heating is electric, and cooling is provided by window units.
Key Highlights
- Two detached homes on a 0.1758‑acre lot
- 2,050 square feet of combined property size
- Unit mix includes 3 bedrooms and 2 bathrooms plus 2 bedrooms and 1 bathroom
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
$37,091
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
4.12%
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%
$741,820
$741.8K
Cap Rate 7%
$529,871
$529.9K
Cap Rate 9%
$412,122
$412.1K
Market Conditions
NOI Build-Up for 2,050 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
$55.4K $27.00/SF
− Vacancy
−$2.4K −$1.15/SF
EGI
$53.0K $25.85/SF
− OpEx
−$15.9K −$7.75/SF
NOI
$37.1K $18.09/SF
Area
Fullerton, CA
Vacancy
4.27%
Lease Rate
$27.00 /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%
$741,820
Cap Rate 7%
$529,871
Cap Rate 9%
$412,122
Alternative Uses
Best Use
Multifamily LT 5
$529.9K
$463.6K – $618.2K
NOI $37,091 @ 7.0% cap · market cap 4.12%
Second Best
Apartment 5plus
$489.2K
$428.0K – $570.7K
NOI $34,241 @ 7.0% cap · market cap 3.80%
Theoretical Best
Office A
$659.2K
$576.8K – $769.1K
NOI $46,144 @ 7.0% cap · market cap 5.13%
Zoning and permitted uses should be independently verified with authorities.
Property Analytics
Property Profile
Current Use
Lease Details
2
Residential units
100%
Occupancy
Multi-tenant
Tenancy
Yes
Utilities to site
Location Intelligence
Trade Area within ½ mile
2,225
Businesses Nearby
Explore this area
Business Placement
Demographics for 92832, CA
26,277
Population
9,170
Households
2.9
Avg Household Size
35
Median Age
32%
College-Educated
82%
High-School Grad
2.9 sq mi
ZIP Area
9,061
Density / Sq Mi
$92,588
Median Household Income
$42,634
Median Earnings
$2,027
Median Rent
$773,100
Median Home Value
Market
Vacancy Rate% for Multifamily in West 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 separately metered homes offer a diversified residential configuration near Downtown Fullerton amenities.
Where is this duplex located?
The property is located at 513 Williamson Ave Fullerton, CA.
What is the asking price?
The asking price for this property is $899,999.
What are key features of this property?
This property features: Two detached homes on a 0.1758‑acre lot; 2,050 square feet of combined property size; Unit mix includes 3 bedrooms and 2 bathrooms plus 2 bedrooms and 1 bathroom
