Apartment buildings, long considered a real-estate haven, are emerging as the next major trouble spot in the beleaguered commercial-property world, the Wall Street Journal reported. Investors bid up the prices of multifamily buildings for years, attracted by steadily rising rents and the prospect of outsize returns. Many took on too much debt, expecting they could raise rents fast enough to pay it down. Unlike office buildings and malls, which have been hit hard by remote work and e-commerce, rental apartments have low vacancy rates. The apartment sector’s main problem isn’t a lack of demand — rents have soared since 2020 — it is interest rates. The sudden surge in debt costs last year now threatens to wipe out many multifamily owners across the country. Apartment-building values fell 14% for the year ended in June after rising 25% the previous year, according to data company CoStar. That drop is roughly the same as the fall in office values.