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483 Boynton Ave

Thousand Oaks · Berkeley

483 Boynton Ave

Style

Single Family Residence

Zoning

R-1H

Year built

1926

Existing

5 bd · 5 ba

Interior

3,081 sf

Lot size

5,222 sf

$1,895,000

For Sale

Development Scenarios

Here's how you can use existing housing laws to add more housing units to this property. For illustrative purposes only, as actual site conditions should be verified in person.

Single-Family Homes and ADUs on Separate Lots

Add 1 potential unit
$606K estimated cost
$987K future value add

Applicable but Space Constrained: ADU

Loading infill model...

Density level

Density controls will appear after the model finishes loading.

Generating the lot configuration for this scenario and density...

Financials

These estimates model the potential development economics for this scenario using local construction costs and comparable sale prices. They're provided for illustrative purposes only and aren't financial advice.

Selected ScenarioSB9
Estimated Project Cost
$2,557,567
SB9 scenario · 1 new unit · 1,410 new sf
Build Cost / SF
$
SB9 build cost$605,717
24% of project cost
Property acquisition$1,951,850
76% of project cost
Estimated Project Value (2 Year)
$2,881,950
$2,963,228 1-year project value ·
12.7% total ROI
$324,383 potential ROI
Added scenario value$986,950
34% of completed value
Current property value$1,895,000
66% of completed value
Acquisition76%
Soft Costs4%
Hard Costs19%
Value Projections
Today list price$1,895,000
24-month added value$986,950
24-month project value$2,881,950
Potential ROI$324,383
Assumptions
Current sale / sf$733
Average sale / sf$820
Annual growth-7.6%
Comp bedrooms5
Comp radius5 miles
Price / sf sourceAverage sold comps
Added sqft1,410 sf
Cost Breakdown

Unit Economics
Original Property
Acquisition only
Build New Homes
Soft + hard costs
All-In
Total project
# of original homes
N/A
# of new homes
1
Total homes
1
Per Home
N/A
Per Home
$606K
Per Home
$2.56M
# of original sq ft
2,586
# of new sq ft
1,410
Total sq ft
3,996
Per Sq Ft
N/A
Per Sq Ft
$430
Per Sq Ft
$640
Total
$1.95M
Total
$606K
Total
$2.56M
Financing Estimate
Construction Loan

Estimate construction proceeds, cash required, and interest-only payments.

Construction Estimate
Loan Proceeds
Construction basis
Soft + hard costs
$606K
Loan proceeds
65% loan-to-cost
$394K
Cash required
Unfinanced development cost
$212K
Monthly payment
Interest-only estimate
$4K

Timeline

Typical project phasing based on the selected scenario, density, and generated development scope.

Estimated Total Duration

15 months

SB9

Design

Concept design, site planning, and early coordination.

2 months

Month 1 - Month 2

Permitting

Planning review, entitlement approvals, and building permits.

4 months

Month 3 - Month 6

Site Work

Utility coordination, grading, and site preparation.

2 months

Month 7 - Month 8

Construction

Vertical construction through final inspection.

7 months

Month 9 - Month 15

Property Overview

MLS: bridgeMLS

Property information from bridgeMLS

Listed by Jonah Rutkin · EXP Realty of California, Inc

bridgeMLS © 2026. Information Deemed Reliable but not Guaranteed. This information is being provided by bridgeMLS. The listings presented here may or may not be listed by the Broker/Agent operating this website. This information is intended for the personal use of consumers and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data last updated at August 19, 2026 at 10:46 AM PDT.

Location

Data from Type Five
Jurisdiction
Berkeley
Zoning
R-1H
Overlay Districts
Hillside Overlay
Climate Zone
Zone 3
Transit Access (1/2 mi)
Yes (Arlington Av & Boynton Path)

Natural Hazards

Data from Type Five
Flood Zone
X
Liquefaction Risk
No
Landslide Risk
Yes
Fault Zone
Yes

Fire Risk

Data from Type Five
Fire Hazard Zone
Berkeley Fire Zone 2
Fire Responsibility
LRA
Wildfire Protection Req.
Yes
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