For architecture buffs/fanatics/collectors, there's a great Pierre Koenig cantilevering out over the Hollywood Hills, plus three smart Post-and-Beam houses combing original details and attractive renovation.

This weekend, four very stylish San Francisco classics, all different—  a condo actually in the Financial District skyline, an exercise in minimalism in SOMA, a rooftop pied-à-terre, and a classic Pacific Heights condo, updated.

This week, three houses that couldn't be more different from each other. In historic Hancock Park, a madly over-decorated Spanish on North June Street that once belonged to actor Paul Muni, just down the street from a more austere Craftsman/Mission with a great pool.

Last week we had a look at properties in lower Marin County.

One of the best reasons for weekend open houses is the opportunity to see interesting architecture that someone else owns. Open this weekend, an early Cliff May house in Pacific Palisades we wrote about last year and now back on the market.

There's a lot of good Mid-Century architecture in the suburbs around San Francisco. We've left out the usual suspects— tract houses by Joseph Eichler— and here are three in Marin County from the period plus one completely new house worth seeing.

Whether you call them Spanish or Spanish Mediterranean, these houses are ubiquitous around Los Angeles, available in all price ranges and in varying condition.

Three of the open houses are in Noe Valley, prime hunting ground for young couples with jobs down the Peninsula— the neighborhood is well-served by private transport companies— plus a cottage in a little-known enclave and a downtown condo. We'll let you decide on the sublime/ridiculous part in the comments.

Los Angeles doesn't have a monopoly on bad taste, but it often seems like the city is the nexus of highly individual tastes and money.

Looking at real estate? Here are four condominiums (and one tenancy-in-common) to visit this weekend.