There are so many ways to find your place in this world, GPS and google would probably suffice. If you are more technophobic you may get yourself a Thomas Bros. map.
According to Google, the coordinates are: 37degree53'36.5N 122degree11"10.5W at 655 ft elevation. Will have to confirm with some GPS device.
Here's a quick look at the area 
Contra Costa County collects your property tax and has on-line searches for assessments. It also provides an on-line search of maps and parcels.
The parcel for the house is shown as 229 in the image below or download thepdf filefor higher resolution