Medical Office Building (MOB)
A building for outpatient clinics and physician practices, not overnight care.
Quick Answer
A medical office building (MOB) is a commercial building leased or owned for outpatient healthcare, such as physician practices, specialty clinics, imaging, and minor procedures. Patients arrive and leave the same day. MOBs are usually business occupancies with lighter requirements than hospitals, though specialized suites add plumbing, ventilation, and equipment demands.
The Full Picture
A medical office building looks much like a conventional office building on the outside, but its tenant suites are built for clinical work. Typical uses include primary care, cardiology, orthopedics, dialysis, imaging, and physical therapy. Many are developed by or alongside health systems and sit on or near hospital campuses to capture referrals and shared parking.
Most MOBs are classified as business occupancy under the International Building Code. That keeps them out of the heavier institutional category that applies to buildings where patients cannot self-preserve, although certain uses, such as ambulatory care facilities that render patients incapable of self-preservation, can trigger stricter requirements. Designers confirm occupancy early because it affects fire separation, sprinklers, and egress.
Tenant improvement is the defining construction activity. A shell is delivered with core, structure, and base systems, then each suite is built out with exam rooms, procedure rooms, sinks, medical gas or vacuum in some cases, and heavier electrical for imaging or lab equipment. Floor loading, vibration, shielding for radiology, and plumbing risers are often decided at the shell stage.
Layout efficiency matters because rents are quoted per square foot. Planners balance exam room counts, staff work areas, patient waiting, and clean and soiled utility spaces, while meeting ADA requirements and privacy expectations. Parking ratios are generous compared with other office uses because patient visits are frequent and time-sensitive.
Real Examples
Common Misconceptions
People assume: An MOB is built to the same standard as a hospital.
Actually: MOBs usually fall under business occupancy and need far less redundancy than acute care buildings, though specific suites can bring added requirements.
People assume: Any office building can host a medical tenant without changes.
Actually: Clinical suites need added plumbing, ventilation, electrical capacity, accessibility, and sometimes shielding, which standard office shells may not provide.
Frequently Asked Questions
What does MOB stand for in real estate?
MOB stands for medical office building, a property type leased to physicians, clinics, and other outpatient healthcare providers.
How is an MOB different from an ambulatory surgery center?
An ambulatory surgery center is a licensed facility dedicated to same-day surgical procedures, while an MOB is a multi-tenant building that may contain clinics and, in some cases, an ASC suite.
What occupancy classification is a medical office building?
Most are Group B business occupancy under the International Building Code, but local amendments and specific uses can change that, so it should be confirmed with the authority having jurisdiction.
Why are MOBs often on hospital campuses?
Proximity supports physician referrals, shared services, and patient convenience, and health systems often control the land and parking.
What systems do MOB suites need beyond a typical office?
Additional plumbing for exam room sinks, higher ventilation in some rooms, more electrical capacity, data and security, and shielding or structural provisions for imaging equipment.