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A growing percentage of apartment renters aren’t interested in buying a home as affordability challenges take a bigger toll on American aspirations of homeownership.

In all, 20% of renters said they have no interest in owning a home, up from 17% in August and 13% in 2016, according to results of a semiannual survey of renters by mortgage company Freddie Mac in January.

Two-thirds of renters who plan to continue renting said they are doing so for financial reasons, up from 59% two years ago, according to the survey.

“Housing is becoming less and less affordable. Renting is perceived to be the more affordable housing option,” said David Brickman, an executive vice president at Freddie Mac and head of its multifamily division.

The growing preference for renting comes even as the economy has strengthened and credit has loosened, in theory…