Tax breaks were extended, until the end of the year, for property owners who dedicate a portion of their land as a conservation easement. Here's a possible loophole to get a hefty tax shelter without diminishing the value of the property since existing zoing may restrict development anyway. Read this article in the Wall Street Jouranl and check with your tax attorney.
The wildlife in the Santa Monica Mountains and the Simi Hills depend on each other for genetic biodiversity. Owners of large parcel of land that abut open space who dedicate a wildlife corridor can help the environment AND enjoy tax benefits.