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20 Sunnyside Ave 7,521 SF 94% Leased Office Building Mill Valley, CA 94941 $5,199,000 ($691.26/SF) 7.55% Cap Rate

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EXECUTIVE SUMMARY

Cushman & Wakefield is proud to present 20 Sunnyside Avenue, a premier office building in the heart of Mill Valley’s vibrant downtown.
This trophy asset offers 7,521 square feet of high-end office space and is currently 93.71% leased to a diverse roster of successful professional
and medical tenants. Situated just steps from an array of top-tier restaurants, coffee shops, bars, and amenities, the property embodies
the work-life balance that Mill Valley residents and professionals highly value.
With strong in-place income and staggered lease expirations, 20 Sunnyside provides a rare opportunity to acquire a stabilized, institutional-quality asset with secure cash flow. The property is also strategically positioned to capitalize on Mill Valley’s growing office demand and anticipated near-term rent growth as market fundamentals in Marin County and the Greater Bay Area continue to strengthen.
This offering represents a unique chance to invest in one of the Bay Area’s most sought-after office markets.

ATTACHMENTS

20 Sunnyside OM

PROPERTY FACTS

Sale Type
Investment
Property Type
Office
Property Subtype
Medical
Building Size
7,521 SF
Building Class
A
Year Built/Renovated
1964/2022
Price
$5,199,000
Price Per SF
$691.26
Cap Rate
7.55%
NOI
$392,525
Percent Leased
94%
Tenancy
Multiple
Building Height
2 Stories
Typical Floor Size
3,761 SF
Building FAR
1.33
Lot Size
0.13 AC
Zoning
C-D - Downtown Commercial with variety of professional office and services allowed
Parking
8 Spaces (1.06 Spaces per 1,000 SF Leased)

AMENITIES

  • Signage
  • Skylights
  • Storage Space
  • Central Heating
  • Natural Light
  • Open-Plan
  • Air Conditioning

MAJOR TENANTS

  • TENANT
  • INDUSTRY
  • SF OCCUPIED
  • RENT/SF
  • LEASE END
  • Advantis Global
  • Administrative and Support Services
  • -
  • -
  • -
  • Azreal Katz
  • -
  • -
  • -
  • -
  • Box Credit LLC
  • Finance and Insurance
  • -
  • -
  • -
  • Bright Antenna Records
  • Information
  • -
  • -
  • -
  • California Association-black
  • Professional, Scientific, and Technical Services
  • -
  • -
  • -
  • DeMartini Joint Account
  • -
  • -
  • -
  • -
  • Judy's Breadsticks Of Mendocino Inc
  • Manufacturing
  • -
  • -
  • -
  • Louis & A Demartini Joint Account
  • -
  • -
  • -
  • -
  • Mary McClain
  • -
  • -
  • -
  • -
  • Mill Valley Insurance
  • Finance and Insurance
  • -
  • -
  • -
TENANT INDUSTRY SF OCCUPIED RENT/SF LEASE END
Advantis Global Administrative and Support Services - - -
Azreal Katz - - - -
Box Credit LLC Finance and Insurance - - -
Bright Antenna Records Information - - -
California Association-black Professional, Scientific, and Technical Services - - -
DeMartini Joint Account - - - -
Judy's Breadsticks Of Mendocino Inc Manufacturing - - -
Louis & A Demartini Joint Account - - - -
Mary McClain - - - -
Mill Valley Insurance Finance and Insurance - - -

SPACE AVAILABILITY

  • SPACE
  • SIZE
  • SPACE USE
  • CONDITION
  • AVAILABLE
  • 2nd Fl-Ste E
  • 473 SF
  • Office
  • Spec Suite
  • Now

Newly renovated office spaces in the heart of downtown Mill Valley with extensive window line and views of Mt. Tam. The building is a 3 minute walk to The Depot, Mill Valley Market, Equator Coffee, and a wide variety of other shops, restaurants, and more. Flexible lease terms and move-in ready, available immediately.

Space Size Space Use Condition Available
2nd Fl-Ste E 473 SF Office Spec Suite Now

2nd Fl-Ste E

Size
473 SF
Space Use
Office
Condition
Spec Suite
Available
Now

2nd Fl-Ste E

Size 473 SF
Space Use Office
Condition Spec Suite
Available Now

Newly renovated office spaces in the heart of downtown Mill Valley with extensive window line and views of Mt. Tam. The building is a 3 minute walk to The Depot, Mill Valley Market, Equator Coffee, and a wide variety of other shops, restaurants, and more. Flexible lease terms and move-in ready, available immediately.

Walk Score®
Walker's Paradise (92)
What is a Walk Score®, Transit Score® & Bike Score®?
Walk Score® measures the walkability of any address.
Transit Score® measures access to public transit.
Bike Score® measures bikeability of a location.
What is a Walk Score®
, Transit Score® & Bike Score?
Walk Score® measures the walkability
of any address. Transit Score®
measures access to public transit. Bike Score®
measures bikeability of a location.®

PROPERTY TAXES

PROPERTY TAXES

Parcel Number
028-065-01
Land Assessment
$3,183,600
Improvements Assessment
$2,122,400
Total Assessment
$5,306,000
  • Listing ID: 37113044

  • Date on Market: 8/4/2025

  • Last Updated:

  • Address: 20 Sunnyside Ave, Mill Valley, CA 94941

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