Office Units

Ontario, CA Office Units for Lease

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150 properties
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Renovated Flex Space with Warehouse
Updated: Jun 5
Renovated Flex Space with Warehouse

1115 S Grove, Ontario, CA 91761

$3,980/Mo
Renovated flex space combining private offices with a warehouse area
5 private offices, reception area, conference room, kitchen, and 2 restrooms
Warehouse includes high ceilings, storage room, and a tall roll‑up grade‑level door
Direct frontage along Grove Avenue in Belmont & Grove Business Park
Ample parking and Central Air
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Furnished Office Suite with Conference Room
Updated: Jun 1
Furnished Office Suite with Conference Room

3401 Centre Lake Drive, Ontario, CA 91761

$8,368/Mo
Suite 480 includes 2 private offices, a conference room, storage room, and open work area
Furnished office suite with mountain and I‑10 Freeway views
6‑Story Class A office building constructed in 1990
Immediate access to I‑10 at Haven Avenue
Parking ratio of 4/1,000; covered and reserved parking available
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Class A Office Suite
Class A Office Suite

3401 Centre Lake Drive, Ontario, CA 91761

$4,318/Mo

Multi-office suite with a conference room, storage, and flexible open workspace in a professionally managed building.

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Class A Office Unit
Class A Office Unit

3257 E Guasti Rd Unit 210, Ontario, CA 91761

$8,242/Mo
3,110 sqft

Five offices, a breakroom, and storage support a ready-to-occupy suite configuration.

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Class A Office Unit
Class A Office Unit

3401 Centre Lake Drive, Ontario, CA 91761

$6,430/Mo

Suite 236 combines private offices with open areas configured as training rooms.

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Office Unit with Open Workspace
Office Unit with Open Workspace

3401 Centre Lake Drive, Ontario, CA 91761

$5,788/Mo

Suite 242 includes private offices, storage, a breakroom, and a card-key security system.

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Class A Office Suite
Class A Office Suite

3401 Centre Lake Drive, Ontario, CA 91761

$4,366/Mo

Suite 230 combines four private offices, storage, and an open work area within a professionally managed building.

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First-Floor Office Suite
First-Floor Office Suite

3281 E Guasti Rd Unit 175, Ontario, CA 91761

$8,528/Mo
3,218 sqft

Professional workspace with private offices, collaborative areas, and direct access from the building’s main lobby.

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Flexible Office Suites
Flexible Office Suites

3257 E Guasti Road, Ontario, CA 91761

$8,242/Mo

Office suites offer adaptable layouts, central HVAC, key card entry, and full-service gross lease terms.

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Office Units with Lake Views
Office Units with Lake Views

3237 E Guasti Road, Ontario, CA 91761

$5,489/Mo

Available suites offer divisible layouts with private offices and open work areas.

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Office Unit with Open Plan
Office Unit with Open Plan

3450 Center Lake Dr Unit 125, Ontario, CA 91761

$9,596/Mo
3,621 sqft

Two-story Class A office property with secure access, professional management, and flexible suite configuration near major freeways.

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Class A Office Units Near I-10
Class A Office Units Near I-10

3450 Center Lake Drive, Ontario, CA 91761

$7,510/Mo

Two-story office suites provide flexible configurations, covered parking, card-key security, and full-service gross lease terms.

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Class A Office Suites
Class A Office Suites

3450 Center Lake Drive, Ontario, CA 91761

$9,596/Mo

Two-story office property with controlled access, flexible suite configurations, and full service gross lease terms.

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Class A Office Suite
Class A Office Suite

4141 Inland Empire Boulevard Unit 220, Ontario, CA 91764

$6,808/Mo
2,569 sqft

Suite 220 combines reception, offices, conference space, and a breakroom within a professionally managed building.

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Professional Office Unit with Conference Room
Professional Office Unit with Conference Room

3281 E Guasti Road, Ontario, CA 91761

$8,528/Mo

First-floor office suite with private offices, open work areas, a breakroom, and lobby-level access.

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Office Suite with Airport Views
Office Suite with Airport Views

3281 E Guasti Road, Ontario, CA 91761

$5,281/Mo

Move-in-ready suite with a conference room, private office, file room, and open workstation area.

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Class A Office Space Available
Class A Office Space Available

3257 E Guasti Road 210, Ontario, CA 91761

$8,242/Mo
11,777 sqft

Premium office space in Centrelake Business Park with lake views.

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Office Suite with Training Room
Office Suite with Training Room

3110 E Guasti Road, Ontario, CA 91761

$2,525/Mo

Open-plan office space includes a training room equipped with audiovisual technology.

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Office Unit with Water View
Office Unit with Water View

3281 E Guasti Rd Unit 210, Ontario, CA 91761

$2,404/Mo
907 sqft

Professional office suite with workstations layout, breakroom, parking, and a full-service lease structure.

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Office Unit with Five Offices
Office Unit with Five Offices

430 N Vineyard Avenue, Ontario, CA 91764

$7,305/Mo

Suite 125 provides a reception area, conference room, breakroom, card key security, and full-service gross leasing.

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Class A Office Suite
Class A Office Suite

3401 Centre Lake Dr Unit 242, Ontario, CA 91761

$5,788/Mo
2,031 sqft

Four offices, storage, a breakroom, and open workspace support a flexible professional layout.

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First-Floor Office Units
First-Floor Office Units

3998 Inland Empire Boulevard, Ontario, CA 91764

$7,950/Mo

Professional workspace with reception, private offices, conference rooms, kitchen facilities, storage, parking, and freeway access.

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Class A Office Sublease Available
Class A Office Sublease Available

4200 N Center Ave, Ontario, CA 91764

$4,500/Mo
2,295 sqft

Sublease available in premier Ontario Airport location until 2029.

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Furnished Office Suite with Reception
Furnished Office Suite with Reception

430 N Vineyard Avenue, Ontario, CA 91764

$4,244/Mo

Suite 320 offers three private offices, kitchen countertops, and existing furnishings for immediate occupancy.

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Ontario, CA Office Units Lease Rates & Market Statistics

Browse 150 Office Units for lease in Ontario, CA on Realmo, a commercial real estate marketplace serving the Ontario area. The current inventory totals 1,367,022 square feet of properties — an average of ~9,100 SF per listing.

Office Units lease rates in Ontario range from $8.40 SF/Yr at the entry level to $93.20 SF/Yr at the top of the market, averaging $32.33 SF/Yr. That's a 11x spread between entry-level and premium space, making side-by-side comparison of asking rents and lease terms essential. At $32.33 SF/Yr, the local average runs 32% above California's state average of $24.56 SF/Yr.

Ontario accounts for 29% of the 526 office units currently available across San Bernardino County, where nearby markets include Rancho Cucamonga and Victorville. Office Units make up 87% of the 173 Office Spaces currently for lease in Ontario, with asking rates in line with the citywide Office Spaces average. Also worth a look for tenants weighing alternatives: Office buildings (22 listings) and Coworking space (5 listings) elsewhere in the Ontario market.

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