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77 Northampton Ave

Berkeley · Berkeley

77 Northampton Ave

Style

Single Family Residence

Zoning

R-1H

Year built

1928

Existing

4 bd · 4 ba

Interior

2,975 sf

Lot size

6,485 sf

$1,295,000

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 1-2 potential units
$736K-$881K estimated cost
$1.8M-$2M future value add

Applicable but Space Constrained: ADU

Demolishing the existing structure may create a viable configuration
Loading infill model...

Density level

Density controls will appear after the model finishes loading.

You can demo a structure as long as its vacant / condemned / owner-occupied, has been off the rental market for 5 years, and has no Ellis act evictions in the past 15 years.

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
$2,069,945
SB9 scenario · 1 new unit · 1,710 new sf
Build Cost / SF
$
SB9 build cost$736,095
36% of project cost
Property acquisition$1,333,850
64% of project cost
Estimated Project Value (2 Year)
$3,059,467
$2,902,096 1-year project value ·
47.8% total ROI
$989,522 potential ROI
Added scenario value$1,764,467
58% of completed value
Current property value$1,295,000
42% of completed value
Acquisition64%
Soft Costs6%
Hard Costs30%
Value Projections
Today list price$1,295,000
24-month added value$1,764,467
24-month project value$3,059,467
Potential ROI$989,522
Assumptions
Current sale / sf$475
Average sale / sf$856
Annual growth9.8%
Comp bedrooms4
Comp radius5 miles
Price / sf sourceAverage sold comps
Added sqft1,710 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
$736K
Per Home
$2.07M
# of original sq ft
2,727
# of new sq ft
1,710
Total sq ft
4,437
Per Sq Ft
N/A
Per Sq Ft
$430
Per Sq Ft
$467
Total
$1.33M
Total
$736K
Total
$2.07M
Financing Estimate
Construction Loan

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

Construction Estimate
Loan Proceeds
Construction basis
Soft + hard costs
$736K
Loan proceeds
65% loan-to-cost
$478K
Cash required
Unfinanced development cost
$258K
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 Michael Gorelick · Christie's International Real Estate Sereno

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 October 21, 2026 at 6:46 PM PDT.

Location

Data from Type Five
Jurisdiction
Berkeley
Zoning
R-1H
Overlay Districts
Hillside Overlay, Open Creek Setback (BMC 17.08)
Climate Zone
Zone 3
Transit Access (1/2 mi)
Yes (551 Spruce St · 0.14 mi)

Natural Hazards

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

Fire Risk

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