Why are some of Southern California’s most expensive properties left completely empty?

Why are some of Southern California’s most expensive properties left completely empty?

As development fills every crack of L.A. County, some of the most prized parcels are left untouched. Why?

https://www.yahoo.com/now/why-southern-californias-most-expensive-130041200.html?guccounter=1&guce_referrer=aHR0cHM6Ly93d3cuZHJ1ZGdlcmVwb3J0LmNvbS8&guce_referrer_sig=AQAAANPeylwwjHLULhvl8M3Axe6smpgj5G88bvXoic7Yyfdj9K47FMfNhbp2akoCNYXW1OCP7Kk3MQLQB-heopkau-xM0EfIISLKT76qer4IjOdpFc1T6XJUJhuBN0iKoWchkO8wIkYNVhtf5NQF9pfaqXk-ctQdp5bIH3lRTFBkQ-hX