Congrats on having a big lot and exploring the fact iff you can split it.
Kudos to looking into "property development".
A great site is : http://www.cupertino.org/index.aspx?page=274
Your lot would have to be a tleast 12K plus.
Residential Zoning Districts
Single Family (R1)- Detached homes on minimum lot size of 6,000 sq. ft.
Duplex (R2)- Detached homes with two units under same ownership on minimum lot size of 8,500 sq. ft.
Multi-family (R3)- Attached homes such as tri-plexes, four-plexes, townhomes, condominiums or apartments.
Residential Hillside (RHS)- Detached homes on uneven or hilly terrain.
Residential Cluster (R1C) - Small lot development.
You should be just fine. http://www.trulia.com/blog/perry_mistry/