BOSTON — If you thought housing prices were spiraling up again, consider the lowly parking space.

A slab of asphalt, a couple of white lines, it often comes as part and parcel of a home purchase without too much thought. But in cities like Boston, parking spaces are at a premium, and prices have been climbing for years. In certain neighborhoods, the price of a home can go up $100,000 or $200,000 if parking is included, which it often is not, only adding pressure to the supply and demand crunch that drives prices up further.

Jaws dropped in 2009 when someone paid $300,000 for a parking space, which was thought to be a record.

But now, even that has been shattered. At an auction on Thursday, the bidding for a tandem spot — space for two cars, one behind the other — started out at $42,000. It ended 15 minutes later at $560,000.

The spaces are behind 298 Commonwealth Avenue in the Back Bay, one of the costliest neighborhoods in the city.