With the Sunnyvale Armory slated for demolition to make way for permanent low-income housing, north Santa Clara County stands to lose its only cold-weather shelter.

Agencies in Santa Clara Valley have finalized a sweeping conservation plan that will set out guidelines for development in exchange for preserving South Bay creeks, trails and open space. State, county and local agency leaders will meet Thursday morning at the Anderson Dam in Morgan Hill for a signing ceremony to launch the Santa Clara Valley Habitat Conservation Plan.