Waterside Center III

3110 East Guasti Road, Ontario, CA 91761

Property Information

  • For Lease Contact for pricing
  • Property Type Office - General Office
  • Property Size 100,000 SF
  • Lot Size 6.54 Acre
  • Parking Spaces Avail. 520
  • Parking Ratio 5.20 / 1,000 SF
  • Property Tenancy Multi-Tenant
  • Building Class A
  • Year Built 2005
  • Date Updated Apr 20, 2026

Description

Waterside Center III is a Class A general office property totaling 100,000 square feet on a 6.54-acre lot in Ontario. Built in 2005, the building offers ample parking with 520 spaces, providing a parking ratio of 5.2 per 1,000 square feet. The property’s professional design and layout make it an ideal choice for businesses seeking a modern office environment.

The building is conveniently situated near a variety of dining, lodging, and transportation options. Panda Inn and TGI Fridays are within 0.25 miles, while Fairfield Inn Ontario is approximately 0.1 miles away. Comfort Inn & Suites Near Ontario Airport and SpringHill Suites Ontario Airport/Rancho Cucamonga are all within walking distance. Ontario Airport is nearby, and multiple parking lots are within 0.5 miles, providing added convenience for tenants and visitors alike.

7 Spaces Available

#235

Space Type

General Office

Lease Rate

Contact for pricing

Total Space

952 SF

Floor

2

Divisible Space

952 - 952 SF

Available Date

Immediate

Lease Type

Full Service

Renewal Option

Yes

Sublease

No

Open floor plan / training room with AV equipment

#255

Space Type

General Office

Lease Rate

Contact for pricing

Total Space

921 SF

Floor

2

Divisible Space

921 - 921 SF

Available Date

Immediate

Lease Type

Full Service

Renewal Option

Yes

Sublease

No

Open floor plan / training room with AV equipment

#265

Space Type

General Office

Lease Rate

Contact for pricing

Total Space

953 SF

Floor

2

Divisible Space

953 - 953 SF

Available Date

Immediate

Lease Type

Full Service

Renewal Option

Yes

Sublease

No

Open floor plan / training room with AV equipment

#275

Space Type

General Office

Lease Rate

Contact for pricing

Total Space

947 SF

Floor

2

Divisible Space

947 - 947 SF

Available Date

Immediate

Lease Type

Full Service

Renewal Option

Yes

Sublease

No

Open floor plan / training room with AV equipment

#300

Space Type

General Office

Lease Rate

Contact for pricing

Total Space

8,653 SF

Floor

3

Divisible Space

8,653 - 8,653 SF

Available Date

Immediate

Lease Type

Full Service

Renewal Option

Yes

Sublease

No

Reception area, 6 offices, conference room, large

bullpen and storage/IT room

Contacts

Taylor Ing

Newmark

Lynn Yangchana

MGR Real Estate

Michael G. Rademaker

MGR Real Estate

Location

Contact Waterside Center III
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