St. Mark's Presbyterian Church, 3809 E. Third Street, Tucson, Arizona.The church is just west of Alvernon between 2nd and 3rd streets, south of Speedway. We usually meet in the Knox room on the southwest corner of the church complex. We enter through a gate at the South side of the Ramada just South of the Knox room.If we are using a special location for a meeting or class [like the geneva hall area], we try to post signs at the church.