This should have been absolutely expected. Tech giants were even buying up offices during the pandemic ostensibly in anticipation of larger workforces in the Bay Area.
Google and Facebook both expanded their real estate along the Embarcadero waterfront. On the retail side, Ikea made its first purchase for a retail store in SF. Construction hasn't taken a back seat in SF during the lock down. These stories often get hidden by the catchy headlines of who's shutting down offices and going fully remote.
Google and others also bought offices in places like Sunnyvale, north San Jose (not the downtown site but rather a separate one), etc