COTA's Mobility Services Facility is located at 1330 Fields Avenue in Columbus. COTA's Mainstream demand-response program moved into the then-new, sustainable facility in January 2011. The paratransit facility houses all of its operations, maintenance, and administration in a single location. The facility cost $21.7 million, with 85 percent of the cost federally funded. The Mobility Services Facility holds 110 paratransit vehicles, 6 vehicle maintenance bays, administrative offices, an eligibility assessment center, one bus wash, and two fueling islands. The building relies heavily on natural light, reducing its dependence on artificial lighting. The building also contains a rainwater harvesting system which captures and stores the water for use by the bus wash and toilets. The landscape was also designed to be low maintenance and to not require an irrigation system. Additionally, the HVAC system was built below-floor providing both heat and air conditioning, which reduces the heat or cool air lost when traveling through typical air ducts.