It seems to be an increase in both absolute number of sales and increase in the percentage. Some signs indicate hedge funds purchasing consumer real estate (houses/apartments) is working towards an all time high thanks to the bottom falling out of the commercial real estate market in 2020 and it being far less reliable an investment post remote-work culture. A lot of commercial real estate investors have flipped to consumer real estate in a way they hadn't before. It may be a while before a new equilibrium happens.

(This is where investments in risky things like flipping various cities' "downtown' commercial real estate into additional consumer real estate are starting to look really interesting, especially in some of the cities that had massive corporate tower investments just pre-2020. It's also where you see some cities directly and indirectly pressuring major corporations into RTO policies in the hopes of it releasing some of the pressure on the consumer real estate market in those cities by encouraging hedge funds to reinvest in corporate real estate. It's hard not to feel those pressures are somewhat futile long term, but to feel sympathy for why they seem like necessary short term sandbagging projects.)