Vacant Lot or Land for sale by owner in Lake Gregory, CA 92325. Lake Gregory, Crestline - Vacant lot www.buyvacationland.com (800) 785-6185 / owner **** Financing Guaranteed, Owner Financing Don't wait to buy land. Buy land and then wait. Area Information: Mountain Resort, Lake Gregory Regional Park is a neighborhood within the area of Crestline, in the County of San Bernardino, within the State of California. Lake Gregory Regional Park is an alpine jewel nestled in the pine forests of Crestline... See site for full property details.