Medical office space · data as of September 2026
Medical office space for lease in Fallbrook
6 buildings with 19,326 SF of medical space available across 8 listed spaces. Three buildings publish an asking rent; no class has five or more on one lease structure, too few to call a figure typical.
Nothing with medical space listed in Fallbrook this September was built after 1988.
Year built isn't a verdict on any one suite. But in a building from the 1980s, whether a suite can take exam rooms comes down to plumbing, ADA restrooms and HVAC capacity, and that decides the build-out budget before the rent does. The six buildings run from 1963 to 1988, median 1980. Class C accounts for four of six.
One more fact changes the read. Of the six buildings, three post no asking rent. The lease read: get a number from every building worth a tour, posted or not, before you pick a favorite. A landlord who knows you're only comparing posted rents knows exactly who it's competing with.
Put together: the newest building went up in 1988, and three of six buildings in Fallbrook post no rent. The numbers that matter here come on request. If you priced Fallbrook today, how many of these six buildings would you actually have a number for?
Fallbrook at a glance
- Buildings
- 6
- Medical space available
- 19,326 SF
- Vacant now
- 10,624 SF
- Largest single space
- 6,767 SF
Asking rents by lease structure
- Modified Gross$1.50–$1.79/SF/mo2 buildings
- NNN$2.10/SF/mo1 building
3 buildings withhold pricing or don't publish it. Those numbers come from the landlords on request.
Full Service includes operating costs and utilities; NNN adds taxes, insurance and common-area costs on top of base rent; Modified Gross splits them. Compare structures, not just rates. These ranges span every building class and age; the questions below compare like with like.
Available spaces by size
- 1–2 rooms0
- 3–4 rooms6
- 5–7 rooms1
- 8–12 rooms1
- 13+ rooms0
Room counts assume 350 to 500 usable SF per exam room, with rentable area 10% to 20% above usable.
Building class
- Class B2
- Class C4
Buildings with medical space available
| Building | Class | Built | Medical space | Largest space | Fits | Asking rent | |
|---|---|---|---|---|---|---|---|
| 1035 S Main Ave Greybill Medical Group | C | 1963 | 6,767 SF1 space
| 6,767 SF | ~11–17 rooms | $2.10/SF/mo NNN | |
| 407 Potter St Haskell Professional building | B | 1976 | 4,605 SF3 spaces
| 1,775 SF | ~2–4 rooms | Withheld ask us | |
| 1672 S Mission Rd | C | 1980 | 2,700 SF1 space
| 2,700 SF | ~4–7 rooms | Withheld ask us | |
| 521 E Elder St Fallbrook Medical Arts | C | 1988 | 1,935 SF1 space
| 1,935 SF | ~3–5 rooms | Withheld ask us | |
| 1516 Main St | C | 1984 | 1,919 SF1 space
| 1,919 SF | ~3–4 rooms | $1.50/SF/mo Modified Gross | |
| 645 E Elder St Village Professional Center | B | 1980 | 1,400 SF1 space
| 1,400 SF | ~2–3 rooms | $1.79/SF/mo Modified Gross |
Availability and asking rates change frequently and are subject to verification. Current terms are confirmed before any tour.
Compared to nearby
| Area | Buildings | Medical space | Published asking rents ($/SF/mo, buildings) |
|---|---|---|---|
| Fallbrook | 6 | 19,326 SF | Modified Gross $1.50–$1.79 (2) · NNN $2.10 (1) |
| Vista | 13 | 103,382 SF | NNN $1.59–$2.65 (4) · Gross + Utilities & Janitorial $1.93–$2.00 (2) · Gross + Electric $2.15 (1) |
| Oceanside | 10 | 89,670 SF | NNN $2.50–$3.25 (3) · Gross + Utilities $2.95–$3.00 (2) · Gross + Electric $2.00 (1) |
| San Marcos | 10 | 61,193 SF | Gross + Electric $2.15–$2.95 (2) · Gross + Utilities $2.20 (2) · Lease type not stated $1.99–$2.05 (1) |
| San Diego overall | 246 | 2,136,242 SF | NNN $1.25–$4.25 (41) · Modified Gross $1.50–$5.28 (34) · Gross + Electric $1.75–$4.45 (13) |
Lowest to highest published building asking rents, grouped by lease structure; the three most common structures are shown. Each range mixes building classes and ages. See the full rent trends report.
Questions about medical office space in Fallbrook
How many medical office buildings have space available in Fallbrook?
Fallbrook has 6 buildings with medical office space available as of September 2026: 19,326 SF across 8 listed spaces. Of that, 10,624 SF is marked vacant now, and the largest single space is 6,767 SF, about 11 to 17 exam rooms.
What do medical office leases cost in Fallbrook?
In Fallbrook, three buildings publish an asking rent with a named lease structure, but no class has five or more on one structure, too few to call any figure typical: Class B on Modified Gross in one, Class C on Modified Gross in one and Class C on NNN in one. Another three buildings post no asking rent; those landlords quote on request. Full Service includes operating costs and utilities, NNN adds taxes, insurance and common-area costs on top, and Modified Gross splits them, so compare total occupancy cost, not the headline rate.
How much space does a medical practice need in Fallbrook?
About 385 to 600 rentable square feet per exam room. That's 350 to 500 usable square feet (the room plus its share of waiting, work areas, storage, restrooms and halls), and leases are quoted in rentable square feet, which run 10% to 20% above usable in multi-tenant medical buildings. In Fallbrook, the listed spaces break down as 6 for 3 to 4, 1 for 5 to 7 and 1 for 8 to 12.
How current is the Fallbrook availability?
It's from the September 2026 survey of medical office availability. Spaces lease and asking terms change between monthly pulls, so current availability, rent and tenant improvement allowance are confirmed with each landlord before any tour.
Send me what fits in Fallbrook
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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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