Gentz Construction, Inc. Share: Construction - Commercial T.I. and Remodel Visit Website Request Info 2570 San Ramon Valley Blvd. A101B San Ramon, CA 94583 925-820-8883 About Map About Gentz Construction, Inc. is a family owned general contracting firm specializing in Home Remodeling and Commercial TI. What's Nearby? Distance: 5 10 15 20 25 50 mi.