To be clear:
In addition to Qdoba and Sing It or Wing It, several other entities use the building at 412 Market Street. The Warehouse, for example, uses part of the space as a music venue. (warehousevenue.com)
Mosaic Church (pastored by Tim Reid) leases most of the building, including the Market Street entrance. The space known as Club Fathom is also the space where Mosaic meets on Sundays at 5.
Club Fathom is a ministry of Mosaic Church. The link between Club Fathom and Mosaic varies. Sometimes, the church organizes events as outreach; at other times, it simply rents the venue to groups.
The same space is rented by River City Church, an unaffiliated Acts29 church. At 11 am on Sundays, River City meets in the same space as Mosaic / Fathom.
Ironically, the parking lot in the rear is maintained and used (during working hours) by the police department.