NEW YORK ( TheStreet) -- According to Rosen Consulting Group, the U.S. privately owned medical office market totaled about 478 million square feet in 2011. An estimated 74.2 million square feet, or 15.5%, of that total was owned by publicly traded health care real estate investment trusts. According to the last comprehensive survey of buildings from the U.S. Energy Information Administration, the total square footage of all outpatient facilities was 1.3 billion in 2003. With the Affordable Care Act adding around 35 to 45 million insured patients to the marketplace, the utilization of health services should increase. This bodes well for hospitals' and physicians' volume and is a net positive for hospitals and the owners of on-campus medical office buildings. Although coverage for these additional new patients is expected to be funded in part by Medicare and Medicaid cuts to providers, the increased volume for hospitals and physicians is expected to offset any reimbursement cuts.