SB 827 creates density and height zoning minimums near transit.
  Under SB 827, parcels within a half-mile of high-connectivity transit
  hub — like BART, Muni, Caltrain, and LA Metro stations — will
  be required to have no density maximums (such as single family
  home mandates), no parking minimums, and a minimum height limit
  of between 45 and 85 feet, depending on various factors, such
  as whether the parcel is on a larger corridor and whether it is
  immediately adjacent to the station. A local ordinance can increase
  that height but not go below it. SB 827 allows for many more
  smaller apartment buildings, described as the “missing middle”
  between high-rise steel construction and single family homes.

I think this is overstepping a lot and I hope it fails. Muni is very much within san francisco where there is high density housing, but does this mean all stops? There's a million muni stops and some of them are in areas that don't need such high density. BART can travel very far outside the city to less dense areas. Some caltrain stations are very suburban. This says all parcels within half mile of those station need to be higher density, that is a LOT of homes. You are telling those people who live there that they can never rebuild? If they want to rebuild their house they need to make it into an apartment complex? Is their parcel even big enough for that?

There's hundreds and hundreds of 5,000sqft lots within a half mile of caltrain. Your house burns down in a fire, you cant build it back? A 45 foot house would be at least 3 stories. It's one thing to say we need more dense homes in this area. But if the area was designed and laid our for single family homes with small single family lots, how is putting a 3 story house on those small lots going to help? It's also saying there's no minimum parking requirements. Not that you could really get any underground parking on some of these lots but street parking is going to be trashed as well? It's the suburbs! You do need a car out there! Caltrain/Bart is not the only form of transportation you use!

This seems really shortsighted and ignores the problem that each city and community is a little different. Some cities along the Bart/Caltrain lines could handle this. Others could not. A top down approach saying everything is the same and must follow these rules is not going to work