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55 Union St, San Francisco, CA 94111
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Property summary
AI-generated overview
55 Union Street is a historic four-story office building totaling approximately 44,976 square feet, configured with creative office spaces featuring exposed brick and timber elements and high ceilings that support natural light. The building is designed with efficient floor plates of about 10,000 square feet, which can accommodate either a single, full-building headquarters configuration or multiple tenants. It is situated in San Francisco’s North Waterfront area, located between Jackson Square and the Embarcadero, with proximity to landmarks such as Coit Tower and the waterfront attractions. The property consists of a brick-and-timber historic office structure.
Property profile
Verified
Property type
Office buildings
Use group
OFFICE BUILDING
Year built
1900
Construction
TILT-UP CONCRETE
Total area
45,000 SF
Lot
0.21 ac (9,000 SF)
Zoning code
C2
APN
0111 -004
UPID
US09-6148546
Cap rate & NOI
Priority signal for investors
Implied cap rate, NOI & suggested price
Cap rate vs submarket · NOI estimate · 3 price anchors
Current use
Occupant on record · Public records
-
Advertising Agency Marketing & Advertising
-
Advertising Agency
-
Marketing & Advertising Advertising Agency
Location
Value estimations
Realmo proprietary · 4 methods
AI Approach
AI
$8.40M
CAP Approach
CAP
by Request
Comparable Approach
Comparable
$11.50M
Blend (final)
Blend
$9.81M
Owner & transaction history
since 2021
Last sale
$9.9M
3 recorded transactions
Zoning & alternative use
C2 · San Francisco, CA
Comparables
6 recent transactions · within 1.5 miComparable in this city
6 recent transactions
Comparable in this City
Similar Nearby for Sale
Similar Nearby for Lease
Recent comparable sales
Sale price & price/SF · Sale date & distance · Adjustments & confidence
Value estimation
Instant AI valuation built from comps, income signals, and proprietary benchmarks. A defensible range, not a single guess.
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Full NOI reconstruction, selected comps, alternative-use scenarios, data audit and PDF export.
Sensitivity value band
Source audit · 6 inputs
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Summary
1
Valuation conclusion
Included free
Estimated market value
$9.81M
Value range
$8.82M – $10.79M
±10% around blend
Estimated value / SF
$218 / SF
Confidence
Property data
100
Market benchmarks
100
Comparable evidence
60
$8.82M
blend $9.81M
$10.79M
Market-derived valuation under stabilized market assumptions. Desktop analysis. No physical inspection performed.
2
Subject property
Included free
GBA
45,000 SF
Lot area
0.21 ac
Year built
1900
Stories
4
APN
0111 -004
Zoning
C2
Assessed value
$12,058,940
Annual tax
$142,052
3
Income approach: direct capitalization
Partial preview
Not enough income data on file for a CAP-approach estimation.
4
Sales comparison
Partial preview
Sales approach indication
$11.50M
Range $11.37M – $32.71M
Evidence
6 found
Recent peer sales in this city
5
Sensitivity & risk
Partial preview
Downside
−10%
Base
$9.81M
Upside
+10%
Bounds of the ±10% band vs the blend — never simulated scenarios.
6
Current market position
Included free
Benchmark
Observed band ($/SF)AverageSubject delta
ZIP 24 sales
$430
-49%
Submarket 244 sales
$479
-55%
County 244 sales
$479
-55%
Band = middle half (Q1–Q3) of recorded sale $/SF for this use type per geography; the diamond marks the subject at $218/SF. Delta below average reads as headroom. Source: Realmo CRE sales derivatives (county records).
7
Data & methodology
Included free
Building area
County record
Property tax
County record
Assessed value
County record
Zoning designation
County record
Operating expenses
Not available
Market rent
Not available
Not analyzed due to unavailable source data: actual rent roll, tenant leases, physical condition and capital
requirements are outside a desktop analysis.
Cost Approach excluded: replacement-cost inputs are not on file.
Automated valuation analysis, not a licensed appraisal. Figures are derived from public
records and proprietary models. Desktop analysis: no physical inspection, tenant leases or reported
property income. Verify with a licensed appraiser before transacting.
Cap rate
Cap rate calculated from real income and expense signals, benchmarked against sales of similar assets nearby.
Unlock the complete Cap Rate workflow
Full market tables, editable assumptions, comparable evidence, saved work and exports.
9-scenario matrix
Market rates by use type
PDF export
Professional Plan · 30 reports
from $99/month
from $99/month
Overview
No cap rate is computable for this property yet: no recorded sale, income signal or market-rate row for its use type.
Price sensitivity
The rate is the decision lever; valuation is the consequence.
Test a cap rate
Implied value$9.90M
Move the market yield to see immediate price impact.
Value / SF
$220
Vs. selected
Base
Derivation
NOI ÷ cap
Arithmetic over the derived NOI * — not market scenario modeling.
NOI × cap matrix
Preview
Preview of 9 modeled outcomes.
NOI
5.00%7.00%9.00%
$624k
$12.47M
$8.91M
$6.93M
$693k
$13.86M
$9.90M
$7.70M
$762k
$15.25M
$10.89M
$8.47M
NOI sensitivity ±10% across the 5 / 7 / 9% anchors — derivation of the NOI above.
Property tax & assessments
Tax year 2024Property tax & assessments
Tax year 2024
Tax billed
$142,052
Tax year 2024
Assessed value
$12,058,940
Assessed 2024
Previous assessed
$12,058,940
+0.0% YoY
Effective rate
1.18%
On assessed value
Assessed land
$7,431,720
Assessed improvement
$4,627,220
Applied tax rate
1.0000
Automated cap rate analysis. Based on public records, market benchmarks and proprietary
models. Verify with a licensed professional before transacting.
Property description
Physical attributes from public recordsBuilding & lot
Public records
Property type
Office buildings
Use group
OFFICE BUILDING
Status
For Lease
Year built
1900
Construction
TILT-UP CONCRETE
Heating
NONE
Stories
4
Units
1
Rooms
40
Bathrooms
8
Total area
45,000 SF
Lot
0.21 ac (9,000 SF)
Zoning code
C2
APN
0111 -004
UPID
US09-6148546
Jurisdiction
SAN FRANCISCO
Metro division
SAN FRANCISCO-SAN MATEO-REDWOOD CITY, CA METROPOLITAN DIVISION
Zoning & alternative use
C2 · San Francisco, CAZoning C2 · permitted uses
C2 · San Francisco, CA
Permitted & conditional uses
Allowed uses · Special-permit conditions · Prohibited uses
Building & site characteristics
From public records
Year built
1900
Construction
TILT-UP CONCRETE
Heating
NONE
Stories
4
Units
1
Rooms
40
Bathrooms
8
Lot
0.21 ac
Zoning
The recorded zoning designation, what the district officially allows, and the municipal source it comes from.
Zoning designation
County-recorded code
C2
Jurisdiction
San Francisco, CA
Recorded code
C2
Zoning Insight
What can be built and operated here — officially.
The district profile from the municipal source: what is on file for C2 in San Francisco, CA.
What opens after registration
Zoning profile
2 official documentsVerified municipal sources with file download
Match provenanceAssignment basis, match tier and confidence
Private report access
See the official zoning profile for this address.
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Ownership Intelligence
Find the owner behind the property.
Unlock the evidence behind ownership: portfolio, transactions, debt and signals that help you decide who to contact next.
What opens after registration
Ownership report
Owner identityResolved entity and name variants
Portfolio holdingsLinked properties and estimated value
Deal signalsSell-side activity worth following
Debt & historyRecorded loans and transaction history
Private report access
See the ownership record for this address.
Registration is required before any owner information is shown.
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Owner of record and activity signals are derived from public records and modeled classifications.
They do not confirm beneficial ownership or intent to transact.
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