Medical office space · data as of September 2026
12139 Mt Vernon Ave, Grand Terrace
1 medical office space listed, 1,568 SF in all, largest 1,568 SF (about 2 to 4 exam rooms). It's vacant now. Asking $1.50–$2.67/SF/mo on a Modified Gross basis.
Listed spaces at 12139 Mt Vernon Ave
| Space | Use | Term |
|---|---|---|
| Suite 110 · 1,568 SF · available now | Office/Medical | Negotiable |
Sizes are rentable square feet. Listed with the building as of September 2026. Availability, asking terms and tenant improvement allowance are confirmed with the landlord before any tour.
- Medical space listed
- 1,568 SF
- Largest space
- 1,568 SF
- Fits
- ~2–4 rooms
- Vacant now
- 1 of 1
Asking rent and building facts
Asking rent
- Modified Gross$1.50–$2.67/SF/mobuilding asking range
San Bernardino for comparison
- Modified Gross$1.45–$2.90/SF/mo10 buildings
- NNN$1.15–$2.25/SF/mo4 buildings
- Full Service$1.55–$2.00/SF/mo2 buildings
- Gross + Electric$1.50–$1.85/SF/mo1 building
- Gross + Utilities$1.53/SF/mo1 building
- Gross + Utilities & Janitorial$2.50/SF/mo1 building
- Lease type not stated$1.60–$1.68/SF/mo1 building
Lowest to highest published building asking rents in San Bernardino, grouped by lease structure. Full Service includes operating costs and utilities; NNN adds taxes, insurance and common-area costs; Modified Gross splits them.
Building
- Building classClass C
- Built1971
- Stories2
- Rentable building area12,272 SF
- Parking ratio3.25 per 1,000 SF
- Leased86%
Hospitals near 12139 Mt Vernon Ave
- Loma Linda University Medical Center, Loma Linda3.2 mi
- Loma Linda University Children's Hospital, Loma Linda3.2 mi
- Loma Linda VA Medical Center (VA), Loma Linda3.7 mi
Straight-line miles from the Census Bureau geocode of each hospital's address on the CMS hospital list.
Other buildings with medical space in San Bernardino
- 22545 Barton Rd 1,300 SF · $1.53/SF/mo
- 1550 E Washington St 5,000 SF · $2.90/SF/mo
- 1023-1027 S Mt Vernon Ave Mt Vernon Business Center 4,559 SF · $1.50–$1.85/SF/mo
- 1003 E Cooley Dr Mount Vernon Plaza 680 SF · $1.55/SF/mo
See every building in the San Bernardino trade area guide.
Questions about 12139 Mt Vernon Ave
What medical office space is available at 12139 Mt Vernon Ave?
12139 Mt Vernon Ave in Grand Terrace lists 1 medical office space, 1,568 SF in all, as of September 2026: Suite 110 · 1,568 SF · available now. Sizes are rentable square feet.
What is the asking rent at 12139 Mt Vernon Ave?
$1.50–$2.67/SF/mo, on a Modified Gross basis, as published for this Class C building, built in 1971.
How many exam rooms fit in the largest space at 12139 Mt Vernon Ave?
About 2 to 4. The largest listed space is 1,568 SF, and planning runs 385 to 600 rentable SF per exam room (350 to 500 usable, plus a 10% to 20% load factor, the share of common areas billed to each tenant). Plumbing, ADA restrooms and HVAC decide whether that count works in a building that wasn't built for exam rooms. This one dates to 1971.
Which hospitals are near 12139 Mt Vernon Ave?
Loma Linda University Medical Center is the closest, 3.2 miles away. Also nearby: Loma Linda University Children's Hospital, Loma Linda, 3.2 miles; Loma Linda VA Medical Center (VA), Loma Linda, 3.7 miles. Distances are straight-line miles to each hospital's address on the CMS hospital list.
Is the availability at 12139 Mt Vernon Ave current?
It's from the September 2026 survey of medical office availability. Availability, rent and tenant improvement allowance are confirmed with the landlord before any tour.
Ask about 12139 Mt Vernon Ave
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Your advisor
Jamal Brown
Real Estate Broker · CA DRE #01780052
Jamal has spent more than 23 years in commercial real estate and has negotiated and audited more than 1,000 leases. He represents medical practices as tenants and buyers, never landlords, across Los Angeles, Orange County, San Diego and the Inland Empire. Every request sent through this site gets a reply within one business day.
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