List Search

400 N Mountain Ave
Upland, CA 91786

$575 - $8,729 USD/MO

Medical For Lease  •  230+ SF

Property Details

  • Property Type Medical
  • Year Built 1987
  • Total Building Size 47,850 SF
  • Tenancy Multiple
  • Building Class B
  • Zoning C/O-MU
31 Transit Score
76 Walk Score

11 Spaces Available

Name Space Use Size Rent Details
1st Floor Ste 101 Medical Office 2,800 SF $33.00 USD/SF/YR 
Shell space available. Ideal For Office + Medical Uses. Surrounded by Many Retail Amenities. 
Executive Suites Available as well.

  • Date available: Now
  • Lease term: Negotiable
  • Service type: Full Service Gross
  • Space Type: Relet
  • In Contiguous block: 5,974 SF
1st Floor Ste 104 Medical Office 3,174 SF $33.00 USD/SF/YR 
Shell space available. Ideal For Office + Medical Uses. Surrounded by Many Retail Amenities. 
Executive Suites Available as well.

  • Date available: Now
  • Lease term: Negotiable
  • Service type: Full Service Gross
  • Space Type: Relet
  • In Contiguous block: 5,974 SF
2nd Floor Ste 211 Office 1,595 SF $30.00 USD/SF/YR 
2 Offices, Bullpen

  • Date available: Now
  • Lease term: Negotiable
  • Service type: Full Service Gross
  • Built out as: Standard Office
  • Space Type: Relet
2nd Floor Ste 215 Office 1,815 SF $30.00 USD/SF/YR 
3 Offices, Bullpen

  • Date available: 30 Days
  • Lease term: Negotiable
  • Service type: Full Service Gross
  • Built out as: Standard Office
  • Space Type: Relet
2nd Floor Ste 229 Office 257 SF $30.00 USD/SF/YR 
Executive Suite

  • Date available: Now
  • Lease term: Negotiable
  • Service type: Full Service Gross
  • Built out as: Standard Office
  • Space Type: Relet
2nd Floor Ste 230 Office 257 SF $30.00 USD/SF/YR 
Executive Suite

  • Date available: Now
  • Lease term: Negotiable
  • Service type: Full Service Gross
  • Built out as: Standard Office
  • Space Type: Relet
2nd Floor Ste 231 Office 230 SF $30.00 USD/SF/YR 
Executive Suite

  • Date available: Now
  • Lease term: Negotiable
  • Service type: Full Service Gross
  • Built out as: Standard Office
  • Space Type: Relet
2nd Floor Ste 233 Office 257 SF $30.00 USD/SF/YR
  • Date available: Now
  • Lease term: Negotiable
  • Service type: Full Service Gross
  • Built out as: Standard Office
  • Space Type: Relet
2nd Floor Ste 234 Office 257 SF $30.00 USD/SF/YR
  • Date available: Now
  • Lease term: Negotiable
  • Service type: Full Service Gross
  • Built out as: Standard Office
  • Space Type: Relet
2nd Floor Ste 249 Office 555 SF $30.00 USD/SF/YR 
Executive Suite

  • Date available: 30 Days
  • Lease term: Negotiable
  • Service type: Full Service Gross
  • Built out as: Standard Office
  • Space Type: Relet
3rd Floor Ste 300 Medical Office 2,550 SF $30.00 USD/SF/YR 
Built-out medical space available. Reception, 5 Exam Rooms, Lab, Breakroom, Nurses Station, Doctor's Office.
Elevator Served. Surrounded by Many Retail Amenities. 
Executive Suites Available as well.

  • Date available: Now
  • Lease term: Negotiable
  • Service type: Full Service Gross
  • Built out as: Standard Medical
  • Space Type: Relet

Description 

Stewart Plaza offers a prime office and medical environment in the heart of Upland, CA. This professionally managed property features elevator service, abundant parking, and flexible suite sizes ranging from compact executive offices to expansive medical layouts. Tenants benefit from proximity to major transportation corridors, including the 10 and 210 Freeways, ensuring seamless regional connectivity. The surrounding area is rich with retail amenities, creating a convenient and vibrant setting for employees and clients alike.
Medical professionals will appreciate suites designed with exam rooms, labs, and nurse stations, while traditional office users can select spaces with reception areas, private offices, and collaborative bullpens. Executive suites are also available for businesses seeking a turnkey solution. The property’s strategic location near Montclair, Ontario, and Claremont positions tenants within a dynamic Inland Empire market known for strong demographics and growth potential.

Highlights

Elevator-served building with flexible office and medical layouts
Heavy parking and easy access for staff and visitors
Convenient location near 10 and 210 Freeways for regional connectivity
Surrounded by retail amenities for added convenience
Executive suites available for turnkey occupancy

Amenities

  • Atrium
  • Signage

Public Transportation

Commuter RailDriveWalkDistance
Upland (San Bernardino Line - Southern California Regional Rail Authority (Metrolink)) 4 min - 1.6 mi
Montclair (San Bernardino Line - Southern California Regional Rail Authority (Metrolink)) 5 min - 2.3 mi
AirportDriveWalkDistance
Ontario International 11 min - 6.2 mi
John Wayne/Orange County 50 min - 40.1 mi
Long Beach (Daugherty Field) 57 min - 44.0 mi

Parking Details

Parking Available: Yes
Reserved: No
Spaces Provided: 140
Type: Surface
Included in Rent: Yes
Brian Melkesian 626-827-8434 Lee & Associates Commercial Real Estate Services
Brian Melkesian 626-827-8434 Lee & Associates Commercial Real Estate Services