From their website:
History: Palomares House, built in 1888 by the Palomares Family, is one of the oldest houses in Fallbrook. The area around the house was originally part of Rancho Monserate. In 1874, the Rancho's land was divided among the heirs of Ysidro Alvarado. His daughter, Lugarda de Palomares, received a 4500 acre parcel and built a complex of ranch houses, of which only the Palomares House remains. Ranching and a Christmas tree farm are among the past uses of the property and surrounding land.
In 1990, the house and surrounding 1.5 acres of land were donated to the FLC by Otis and Linda Heald, Al and Flo Pinamonti, and Vince and Joy Ross. The house has been restored and a beautiful park now fills the rest of the property with an arboretum, wildlife sculptures and a memorial tile path through lovely gardens.
Palomares House Meeting Room: The Palomares House meeting room and outdoor patio can be rented by members, with restrictions.
The FLC has received hundreds of donations over the past 25 years in memory or in honor of loved ones. You'll see tags on trees and plaques on benches throughout the preserves and along downtown Fallbrook streets.
Personal Experience: The Palomares house is one of the spots that we stopped by while up in Fallbrook. Unfortunately, it was closed. The outskirts sure were pretty though and right across the street in the Dinwiddie Preserve so even if this home isn't open it still may be worth your time. One day I will photograph inside the home, promise!