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918 Royal St

Stonehurst · Oakland

918 Royal St

Style

Single Family Residence

Zoning

RD

Year built

1936

Existing

3 bd · 2 ba

Interior

1,375 sf

Lot size

5,477 sf

$599,000

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.

ADU

Add 2 potential units to the backyard
$455K-$658K estimated cost
$415K-$829K future value add

Single-Family Homes and ADUs on Separate Lots

Add 1 potential unit
$589K estimated cost
$802K future value add
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 ScenarioADU
Estimated Project Cost
$1,072,088
ADU scenario · 2 new units · 704 new sf
Build Cost / SF
$
ADU build cost$455,118
42% of project cost
Property acquisition$616,970
58% of project cost
Estimated Project Value (2 Year)
$1,013,748
$998,643 1-year project value ·
-5.4% total ROI
-$58,340 potential ROI
Added scenario value$414,748
41% of completed value
Current property value$599,000
59% of completed value
Acquisition58%
Soft Costs7%
Hard Costs36%
Value Projections
Today list price$599,000
24-month added value$414,748
24-month project value$1,013,748
Potential ROI-$58,340
Assumptions
Current sale / sf$436
Average sale / sf$547
Annual growth3.8%
Comp bedrooms3
Comp radius5 miles
Price / sf sourceAverage sold comps
Added sqft704 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
2
Total homes
2
Per Home
N/A
Per Home
$228K
Per Home
$536K
# of original sq ft
1,375
# of new sq ft
704
Total sq ft
2,079
Per Sq Ft
N/A
Per Sq Ft
$646
Per Sq Ft
$516
Total
$617K
Total
$455K
Total
$1.07M
Financing Estimate
Construction Loan

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

Construction Estimate
Loan Proceeds
Construction basis
Soft + hard costs
$455K
Loan proceeds
65% loan-to-cost
$296K
Cash required
Unfinanced development cost
$159K
Monthly payment
Interest-only estimate
$3K

Timeline

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

Estimated Total Duration

13 months

ADU

Design

Concept design, site planning, and early coordination.

1 month

Month 1

Permitting

Planning review, entitlement approvals, and building permits.

3 months

Month 2 - Month 4

Site Work

Utility coordination, grading, and site preparation.

3 months

Month 5 - Month 7

Construction

Vertical construction through final inspection.

6 months

Month 8 - Month 13

Property Overview

MLS: bridgeMLS

Property information from bridgeMLS

Listed by Stanley Cornelius · Session 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 August 11, 2026 at 7:11 PM PDT.

Location

Data from Type Five
Jurisdiction
Oakland
Zoning
RD
Overlay Districts
None
Climate Zone
Zone 3
Transit Access (1/2 mi)
Yes (105th Av & E St)

Natural Hazards

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

Fire Risk

Data from Type Five
Fire Hazard Zone
NOT IN VHFHZ
Fire Responsibility
LRA
Wildfire Protection Req.
No
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