Nearly 21,000 families in the four-county Sacramento region, and about a half-million across California, live in homes that are theoretically mobile.

For many, buying a home that’s up on blocks is one of the last opportunities for single-family homeownership in a state with some of the highest housing costs in the nation.

“If you can buy outright, it’s an affordable option,” said Michelle Hutson, who owns her double-wide mobile home in south Sacramento but rents the land beneath it for less than an apartment might cost.

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