If I own a single-family home in California with a conventional loan, can I buy a multi-family or mixed-use property with an FHA loan and owner-occupy for a year?

It can work. The rule to plan around is FHA's 100-mile rule on rental income from the home you are leaving. FHA is an owner-occupied program with guardrails against building a rental portfolio through it. The specific rule here: to use rental income from the home you are vacating to qualify, the new principal residence has to be more than 100 miles from the old one. Your current loan being conventional does not change that, because the rule keys off distance and the use of rental income, and it ignores the loan type on the departing home. If the home has no rental history, also expect the lender to require a market-rent appraisal and documentation of at least 25% equity in the vacated property. Two paths: - New property is more than 100 miles away: you can use the rental income to qualify, with the documentation above. - Within 100 miles: the rental income from your departing home stays out of the math, so you qualify carrying both housing payments on your own income. Worth knowing: conventional financing now allows as little as 5% down on an owner-occupied two-to-four unit primary residence (a late-2023 change), though the terms are not always as favorable as FHA. We can run your specific scenario both ways in the free Roadmap conversation to see which fits.