Medical office space · data as of September 2026
5122 Katella Ave, Los Alamitos Siboney Professional Bldg
1 medical office space listed, 546 SF in all, largest 546 SF (about 1 exam rooms). It's vacant now. Asking $2.50/SF/mo on a Full Service basis.
Listed spaces at 5122 Katella Ave
| Space | Use | Term |
|---|---|---|
| Suite 302 · 546 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
- 546 SF
- Largest space
- 546 SF
- Fits
- ~1 room
- Vacant now
- 1 of 1
Asking rent and building facts
Asking rent
- Full Service$2.50/SF/mobuilding asking range
Los Alamitos, Cypress and Seal Beach for comparison
- NNN$2.20–$2.85/SF/mo5 buildings
- Full Service$2.50–$5.59/SF/mo4 buildings
- Modified Gross$3.00–$3.50/SF/mo2 buildings
Lowest to highest published building asking rents in Los Alamitos, Cypress and Seal Beach, 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 B
- Built1986
- Stories3
- Rentable building area30,323 SF
- Parking ratio4.00 per 1,000 SF
- Leased98%
Hospitals near 5122 Katella Ave
- UCI Health - Los Alamitos, Los Alamitos1.4 mi
- Anaheim Community Hospital, Anaheim2.3 mi
- West Anaheim Medical Center, Anaheim3.1 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 Los Alamitos, Cypress and Seal Beach
- 5255 Katella Ave 31,585 SF
- 10601 Walker St Los Alpress Medical Building 1,759 SF · $2.85/SF/mo
- 4272-4390 Katella Ave 4,560 SF · $2.75/SF/mo
- 4281 Katella Ave Katella Corporate Center 2,952 SF · $3.05–$3.25/SF/mo
See every building in the Los Alamitos, Cypress and Seal Beach trade area guide.
Questions about 5122 Katella Ave
What medical office space is available at 5122 Katella Ave?
5122 Katella Ave in Los Alamitos lists 1 medical office space, 546 SF in all, as of September 2026: Suite 302 · 546 SF · available now. Sizes are rentable square feet.
What is the asking rent at 5122 Katella Ave?
$2.50/SF/mo, on a Full Service basis, as published for this Class B building, built in 1986.
How many exam rooms fit in the largest space at 5122 Katella Ave?
About 1. The largest listed space is 546 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 1986.
Which hospitals are near 5122 Katella Ave?
UCI Health - Los Alamitos is the closest, 1.4 miles away. Also nearby: Anaheim Community Hospital, Anaheim, 2.3 miles; West Anaheim Medical Center, Anaheim, 3.1 miles. Distances are straight-line miles to each hospital's address on the CMS hospital list.
Is the availability at 5122 Katella 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 5122 Katella 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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