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Investment Highlights

  • Highly traveled North Diamond Bar Boulevard frontage with ±38,000 vehicles per day.
  • Building systems and safety infrastructure have undergone recent capital upgrades.
  • Below-Market In-Place Rents with Embedded Mark-to-Market Upside
  • The property is currently 95.1% occupied by 31 signed tenants across ±47,196 SF, with no single tenant representing more than 21% of building.
  • Strong tenant retention supported by proactive maintenance and property improvements.
  • Positioned within one of Southern California’s busiest commercial corridors.

Executive Summary

PLEASE CLICK THE LINK BELOW TO THE LANDING PAGE:
Lee & Associates Pasadena is pleased to present the exclusive opportunity to acquire the Sunset Plaza Professional Building, a ±47,196-square-foot, three-story Class B multi-tenant office building located at 556 N. Diamond Bar Boulevard, Diamond Bar, California. Built in 1988 and consistently well-maintained throughout ownership, the asset is situated on 2.76 acres with a parking ratio of ±4.0 per 1,000 SF. In addition to the on-site count, a reciprocal parking agreement with Global Mission Church, located immediately adjacent to the property, is in-place through March 18, 2033. This agreement provides Sunset Plaza Professional Building occupants access to 49 additional stalls on weekdays and Saturdays from 6:00 AM to 6:30 PM, increasing the effective parking ratio.
The property benefits from prominent frontage along N. Diamond Bar Boulevard, the primary north-south commercial corridor through the City of Diamond Bar. The site is positioned approximately 0.5 miles from the SR-60 / SR-57 Freeway interchange, one of Southern California's highest-volume traffic junctions and a critical commuter route connecting the Inland Empire to Greater Los Angeles. Combined freeway traffic counts at the 60/57 interchange exceed 300,000 vehicles per day (Caltrans, 2024), providing exceptional visibility and accessibility for tenants and their clients.

Property Facts

Sale Type
Investment
Property Type
Office
Building Size
47,196 SF
Building Class
B
Year Built
1988
Price
$10,750,000
Price Per SF
$227.77
Cap Rate
6.81%
NOI
$732,075
Percent Leased
95%
Tenancy
Multiple
Building Height
3 Stories
Typical Floor Size
15,732 SF
Building FAR
0.39
Lot Size
2.76 AC
Zoning
OP

Amenities

  • Property Manager on Site

Space Availability

  • Space
  • Size
  • Space Use
  • Build-Out
  • Available
  • 1st Fl-Ste 106
  • 1,214 SF
  • Office
  • Full Build-Out
  • Now
  • 2nd Fl-Ste 206
  • 274 SF
  • Office
  • Full Build-Out
  • Now
  • 3rd Fl-Ste 304-A
  • 1,576 SF
  • Office
  • Full Build-Out
  • Now
  • 3rd Fl-Ste 308
  • 446 SF
  • Office
  • Full Build-Out
  • Now
Space Size Space Use Build-Out Available
1st Fl-Ste 106 1,214 SF Office Full Build-Out Now
2nd Fl-Ste 206 274 SF Office Full Build-Out Now
3rd Fl-Ste 304-A 1,576 SF Office Full Build-Out Now
3rd Fl-Ste 308 446 SF Office Full Build-Out Now

1st Fl-Ste 106

Size
1,214 SF
Space Use
Office
Build-Out
Full Build-Out
Available
Now

2nd Fl-Ste 206

Size
274 SF
Space Use
Office
Build-Out
Full Build-Out
Available
Now

3rd Fl-Ste 304-A

Size
1,576 SF
Space Use
Office
Build-Out
Full Build-Out
Available
Now

3rd Fl-Ste 308

Size
446 SF
Space Use
Office
Build-Out
Full Build-Out
Available
Now
Fairly walkable
40/100
Exceptionally drivable
100/100
Limited public transit
30/100
Somewhat bikeable
30/100

Property Taxes

Property Taxes

Parcel Number
8706-001-014
Land Assessment
$2,132,687
Improvements Assessment
$3,554,487
Total Assessment
$5,687,174
  • Listing ID: 41042626

  • Date on Market: 6/24/2026

  • Last Updated:

  • Address: 556 N Diamond Bar Blvd, Diamond Bar, CA 91765

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