Office Space for Lease in Ontario, CA
33 office spaces currently for lease in Ontario, CA. Compare sizes and terms, view photos, and connect with the listing brokerage — no middlemen and no recycled leads.
Office Space for lease in Ontario, CA
Showing 24 of 33 office spaces in Ontario, CA — open the app for the full catalog.
More listings in Ontario, CA
Office Space in Ontario right now
Counts, asking prices and listed sizes of listings currently active on Nalren in Ontario, CA — refreshed daily. Not valuations.
About office spaces in Ontario
Office Space in Ontario, CA: 33 active lease listings, 1 of them listed in the last 30 days. Of the 33 with a known on-market date, 1 came to market in the last 90 days, 25 have been listed for three to six months, and 7 for longer. Listed building sizes run from 907 to 22,000 square feet (median 2,483 sqft), in buildings dating from 1985 to 2007. Lease structures stated on current listings: 31 Full service, 1 Gross, 1 Absolute net. 4 office buildings closed in Ontario over the last 24 months at a median sold price of $932,500 ($298 per square foot).
Counts, sizes and asking prices of current listings plus MLS-reported closed sales — refreshed daily. Not valuations.
Office Space in cities near Ontario
Office Space for lease in other CA cities
Recently sold office buildings in Ontario, CA
Latest closed sales
- 545 E California Street — Sold for $490,000 on Aug 21, 2026 (Office · 3,002 sqft)
- 534 N Campus Avenue — Sold for $615,000 on Mar 5, 2026 (Office · 1,422 sqft)
- 5570 W Mission Boulevard — Sold for $4,400,000 on Jul 15, 2025 (Office · 2,000 sqft)
- 534 N Euclid Avenue — Sold for $1,250,000 on Jun 30, 2025 (Office · 8,940 sqft · 11 units)
Sold prices are MLS-reported closed sales recorded in Ontario, CA over the last 24 months — not an estimate or valuation of any property.
Commercial real estate guides
Buying, selling, or leasing commercial property in Ontario, CA?
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Frequently asked questions — Office Space, Ontario, CA
How many office spaces are for lease in Ontario, CA?
Nalren currently has 33 office spaces for lease in Ontario, CA, including 1 listed in the last 30 days. New listings sync from the MLS throughout the day.
How large are the office spaces listed in Ontario, CA?
Of the 33 current listings in Ontario, CA that report a building size, the smallest is 907 square feet and the largest 22,000, with a median of 2,483 square feet.
What have office buildings sold for in Ontario, CA?
4 office buildings closed in Ontario, CA in the last 24 months, from $490,000 to $4,400,000 with a median sold price of $932,500 and a median of $298 per square foot. These are MLS-reported closed sales — not an estimate or valuation of any property.
How are commercial lease rates quoted in Ontario, CA?
Commercial leases are quoted several ways — per square foot per month, per square foot per year, or a gross monthly amount — and NNN (triple-net) leases add taxes, insurance, and maintenance on top of the base rent. Structures stated on current Ontario, CA lease listings: 31 Full service, 1 Gross, 1 Absolute net. Compare each listing's stated terms and confirm the structure with the listing brokerage before comparing rates.
How long have office spaces in Ontario, CA been on the market?
Of the 33 with a known on-market date, 1 came to market in the last 90 days, 25 have been listed for three to six months, and 7 for longer. These are counts of listings currently active on Nalren in Ontario, CA, refreshed daily — not a forecast or valuation.