I live in SF and I&#x27;m active in the real estate businesses too.  While on the surface, this seems like great news it comes with hidden negative externalities.  Specifically, this law benefits existing owners who will be grandfathered out of this requirement.<p>Any new builder will see her housing development costs go up, and given the short supply of housing, will then cause RE prices to go up on all new housing.  This system therefore benefits existing landowners who were able to reap higher gains on existing buildings and helps create a moat on new housing development by making it less financially lucrative.<p>Also, just in case anybody is curious, most solar panels are not a good economic investment for an investor.  In an optimistic case, they may pay for themselves in 7-10 years but the value of the asset itself depreciates so quickly that it isn&#x27;t worth the risk financially or in on-going maintenance costs.