Nearest major arterial cross streets/ freeway exits off HWY 680 are Treat Blvd. (Walnut Creek) and Monument Blvd. (Concord); go east off HWY 680. Make a left onto Oak Grove Road if coming from the freeway via Treat Blvd, or make a right onto Oak Grove Road if coming from the freeway via Monument Blvd. 994 A Oak Grove Road is located on a private drive off Oak Grove Road, next to Concordia Lutheran Church. Nearest cross streets are Chalomar Rd./ Keswick Lane and Whitman Road, each of which is traffic signalled. 994a Oak Grove Road is the second house on the left on the private drive across from the church, a two story house with a bright white roof with solar panel, and battleship gray stucco with rounded corners on the exterior, with lots of decks.