Housing costs are notorious in the San Francisco Bay Area, as visitors for this weekend's Superbowl 50 will experience. In response to the 1 million or more football fans expected to hit the area this weekend, the number of listings on traditional home-sharing sites such as Airbnb and HomeAway has soared, reports the Denver Post's Janie Har.

According to Airbnb, demand is about three times greater than for last year's Super Bowl in Arizona, with homes closer to the stadium listed at higher prices than units in notoriously apartment-squeezed San Francisco. Savvy residents are offering to rent their homes for the game, and some of the listings are mind-boggling.

There's a luxury 8,500-square-foot home in San Jose listed for $10,000 a night. A 400-square-foot cottage in the same city is going for $3,900 for the three-night weekend. A four-bedroom apartment near San Francisco's "Super Bowl City" is listed at $1,495 a night, with a minimum six-night stay.

And let's not forget a cozy treehouse for two in a 150-year-old oak tree a half-hour drive from downtown San Francisco. You can call out for pizza and never mind that the bathroom is down the tree. Best of all, it's just $495 a night.

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