Class A Office Space for Lease in Ontario, CA – Near Ontario Airport
Work with an agent who has direct access to the owner.
Javier Brown · MGR Real Estate, Inc. · DRE #01755491
Call (909) 641-0582 TextTrusted by the pros: Many of the Inland Empire's leading commercial brokerage firms lease their own offices in MGR's Class A office buildings in Ontario, and they're trusted by the professionals who know the market best.
Looking for office space for lease in Ontario, CA? I represent a group of Class A office buildings just minutes from Ontario International Airport (ONT), along Guasti Road, Concours Street and Inland Empire Boulevard. Choices range from a small office for rent or an executive suite of about 900 square feet up to full floors of more than 30,000 square feet, with many suites already built out and ready to move in. The buildings include Empire Towers, Ontario Airport Tower, One Lakeshore Centre, Lakeview Center, Waterside Center and Centrelake Plaza, all owned or leased by MGR Real Estate. I'm not the owner; I'm the leasing agent, and I have direct access to the owner, so you get clear answers on rent, tenant improvements and lease terms without waiting on a chain of middlemen. The location sits by the I-10 and I-15, near Rancho Cucamonga, which makes it a central base for teams serving the whole Inland Empire. Work with an agent who has direct access to the owner. Call or text Javier Brown at (909) 641-0582 for today's available suites and a tour this week.
Orange County office space (Irvine, Costa Mesa, Orange)
Small offices, executive suites and full floors
Suites start around 900 square feet and go up to full floors of more than 30,000 square feet, including executive suites and small offices for rent in Ontario, CA. Many are already built out and ready to move in. Call or text (909) 641-0582 for today's list.
Why work with an agent who has direct access to the owner
- ✔ Direct access to the ownership – no middle layers
- ✔ Faster answers on rates, space and terms
- ✔ I put the deal together: space, improvements, terms
- ✔ Hablo español – full service in Spanish
Office buildings near Ontario International Airport
Asking rates: about $2.65 to $3.00 per SF per month, full service. Rates change, so call Javier Brown (909) 641-0582 for current pricing.
3800 Concours — Floor plans on request — call Javier
Empire Towers I–IV
Available: I 1,298–10,773 SF, II 1,639–17,096 SF, III ~2,995 SF, IV 10,704–36,566 SF (call to confirm)
Empire Towers, 3633 & 4141 Inland Empire Blvd and 3800 & 4200 Concours St, Ontario CA – Class A office campus, 400,976 SF in 4 buildings, minutes from Ontario Airport (ONT).
3633 & 4141 Inland Empire Blvd · 3800 & 4200 Concours, Ontario, CA
400,976 SF · Class A · 4 buildings
Available suites: I 1,298–10,773 SF · II 1,639–17,096 SF · III ~2,995 SF · IV 10,704–36,566 SF
Available (Oct 2026): 1,298–36,566 SF
Ontario Airport Tower
Available: suites about 909–9,935 SF (call to confirm)
Ontario Airport Tower, 2855 E Guasti Rd, Ontario CA – 6-story LEED Class A office tower, 148,000 SF, next to Ontario International Airport.
2855 E Guasti Rd, Ontario, CA
~148,000 SF · Class A · 6 stories · LEED Silver
Available suites: about 909–9,935 SF
Available (Oct 2026): 909–9,935 SF
One Lakeshore Centre
Available: 907–49,692 SF across both buildings (call to confirm)
One Lakeshore Centre, 3281 E Guasti Rd & 3450 Centrelake Dr, Ontario CA – Class A offices, 176,813 SF in 2 buildings, near ONT.
3281 E Guasti Rd & 3450 Centrelake Dr, Ontario, CA
176,813 SF · Class A · 2 buildings
Available suites: 907–49,692 SF
Available (Oct 2026): 907–49,692 SF
Lakeview Center I & II
Asking $2.85/SF/mo
Available: Suites 105 (2,029 SF), 120 (4,431 SF), 210 (3,267 SF) at $2.85/SF/mo (call to confirm). Suite 120 floor plan on request.
Lakeview Center I & II, 3257 & 3237 E Guasti Rd, Ontario CA – Class A offices, 106,345 SF, small suites near Ontario Airport.
3257 & 3237 E Guasti Rd, Ontario, CA
106,345 SF · Class A · 2 buildings
Available suites: Ste 105 – 2,029 SF · Ste 120 – 4,431 SF · Ste 210 – 3,267 SF
Available (Oct 2026): 2,029–4,431 SF
Empire Corporate Center
Available: suites about 1,549–6,186 SF (call to confirm)
Empire Corporate Center, 800 N Haven Ave, Ontario CA – 4-story office building, 80,000 SF, small offices for rent near ONT and Rancho Cucamonga.
800 N Haven Ave, Ontario, CA
~80,000 SF · 4 stories
Available suites: about 1,549–6,186 SF
Available (Oct 2026): 1,549–6,186 SF
Floor plans on request — call Javier
Empire Tower V
Empire Tower V, 3990 Concours St, Ontario CA – 5-story office building, 128,464 SF, built 2007, near Ontario Airport.
3990 Concours, Ontario, CA
128,464 SF · 5 stories · built 2007
Available suites: 943–33,892 SF
Leased by MGR
Available (Oct 2026): 943–33,892 SF
Waterside Center
Waterside Center, 3110 & 3200 E Guasti Rd, Ontario CA – office space, 159,418 SF in 2 buildings, by Ontario Airport.
3110 & 3200 E Guasti Rd, Ontario, CA
159,418 SF · 2 buildings
Available suites: 768–33,781 SF
Leased by MGR
Available (Oct 2026): 768–33,781 SF
Centrelake Plaza
Centrelake Plaza, 3401 Centrelake Dr, Ontario CA – 6-story office building, 114,420 SF, near Ontario International Airport.
3401 Centrelake Dr, Ontario, CA
114,420 SF · 6 stories
Available suites: 1,440–6,653 SF
Leased by MGR
Available (Oct 2026): 1,440–6,653 SF
Frequently asked questions
Who owns these buildings?
They are owned or leased by MGR Real Estate, the firm I work with, per public news reports. I am a leasing agent, not the owner, and I have direct access to the owner.
What sizes are available?
From small executive suites to full floors, depending on current vacancy. Call or text for today's list.
Can I tour this week?
Yes. Call or text me and I'll set up tours, usually within a day or two.
Do you speak Spanish?
Yes, Spanish is my first language.
Is there Class A office space near Ontario International Airport?
Yes. Empire Towers, Ontario Airport Tower, One Lakeshore Centre and Lakeview Center are Class A office buildings minutes from ONT, along Guasti Rd, Concours St and Inland Empire Blvd. Call (909) 641-0582 for current suites.
Do you have small offices or executive suites for rent in Ontario, CA?
Yes. Suites start around 900 SF, with some smaller spaces at times, up to full floors over 30,000 SF. Many come with existing build-outs.
Are these offices close to Rancho Cucamonga and the rest of the Inland Empire?
Yes. The buildings sit by the I-10 and I-15, near Rancho Cucamonga and central to the Inland Empire, with easy access to Ontario Airport.
Office space near Rancho Cucamonga and the Inland Empire
The buildings sit by the I-10 and I-15 near Rancho Cucamonga, in the heart of the Inland Empire, with easy access to Ontario International Airport. That makes them a central base for teams serving Ontario, Rancho Cucamonga and the wider Inland Empire.
Looking for office space? Work with an agent who has direct access to the owner.
Call Text EmailMGR Real Estate, Inc. · 3800 E. Concours St., Suite 350, Ontario, CA 91764 · jbrown@mgrrealestate.com
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Call or Text (909) 641-0582