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240 Tappan Ln

Sleepy Hollow · Orinda

240 Tappan Ln

Style

Single Family Residence

Zoning

RL-40

Year built

1980

Existing

6 bd · 6 ba

Interior

6,800 sf

Lot size

201,286 sf

$5,250,000

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 1-3 potential units
$533K-$1.7M estimated cost
$990K-$3.6M 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
$5,940,143
SB9 scenario · 1 new unit · 1,000 new sf
Build Cost / SF
$
SB9 build cost$532,643
9% of project cost
Property acquisition$5,407,500
91% of project cost
Estimated Project Value (2 Year)
$6,240,000
$6,240,000 1-year project value ·
5.0% total ROI
$299,858 potential ROI
Added scenario value$990,000
16% of completed value
Current property value$5,250,000
84% of completed value
Acquisition91%
Soft Costs2%
Hard Costs7%
Value Projections
Today list price$5,250,000
24-month added value$990,000
24-month project value$6,240,000
Potential ROI$299,858
Assumptions
Current sale / sf$858
Average sale / sf$990
Annual growth0.0%
Comp bedrooms6
Comp radius5 miles
Price / sf sourceAverage sold comps
Added sqft1,000 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
$533K
Per Home
$5.94M
# of original sq ft
6,122
# of new sq ft
1,000
Total sq ft
7,122
Per Sq Ft
N/A
Per Sq Ft
$533
Per Sq Ft
$834
Total
$5.41M
Total
$533K
Total
$5.94M
Financing Estimate
Construction Loan

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

Construction Estimate
Loan Proceeds
Construction basis
Soft + hard costs
$533K
Loan proceeds
65% loan-to-cost
$346K
Cash required
Unfinanced development cost
$186K
Monthly payment
Interest-only estimate
$3K

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 Shannon Conner · Village Associates Real Estate

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 May 29, 2026 at 12:11 PM PDT.

Location

Data from Type Five
Jurisdiction
Orinda
Zoning
RL-40
Overlay Districts
None
Climate Zone
Zone 12
Transit Access (1/2 mi)
-

Natural Hazards

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

Fire Risk

Data from Type Five
Fire Hazard Zone
VERY HIGH (WUI)
Fire Responsibility
LRA
Wildfire Protection Req.
Yes
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