Outlands in the Eighty Acres, Historic building in Carmel-by-the-Sea, United States

Outlands in the Eighty Acres, also called Flanders Mansion, is an 8,000-square-foot Tudor Revival house designed by architect Henry Higby Gutterson and built by contractor Fred Ruhl. Its walls are laid in light grey interlocking precast concrete blocks, advertised at the time as fireproof, waterproof and practically everlasting. It stands at the end of a driveway off Hatton Road, on a hill above the Carmel Mission and Point Lobos.

Paul and Grace Flanders bought 80 acres from Dr. Daniel T. MacDougal and in 1922 hired architect Henry Higby Gutterson, with contractor Fred Ruhl, to build the house they named the Outlands. The City of Carmel purchased the mansion and 14.9 acres from the Flanders heirs in 1972 after Mayor Gunnar Norberg's "Save the Flanders Estate" campaign, and it was listed on the National Register of Historic Places on March 23, 1989.

The house takes its name from the 80 acres Paul and Grace Flanders bought from botanist Daniel T. MacDougal in 1922; they called the estate the Outlands. The Carmel Art Institute later operated in the mansion under John Cunningham. The Flanders Foundation, formed in 1998, maintains the house and the surrounding Mission Trail Nature Preserve.

The house stands at the end of a private driveway off Hatton Road, inside the upper part of Mission Trail Nature Preserve; the city-owned mansion and its 14.9 acres are reached on foot through the preserve. The Flanders Foundation, formed in 1998, helps maintain the grounds.

The house was built with light grey interlocking precast concrete blocks advertised as "fireproof, waterproof and practically everlasting" — not natural stone. The same blocks give the walls their visible grid pattern, a detail visitors can spot from the driveway off Hatton Road.