SB 79 was signed into law Friday.
The law focuses on transit areas where there are no major developments.
SB 79 is changing zoning rules for cities across the state.
The new law allows five and six story building developments in single-family home in areas near transit stations.
The law requires that these projects are built within a quarter mile to a half a mile from transit stops.
Supporters said dense development is key in helping cities like San Diego create more affordable housing.
“We’re sort of ending the one size fits all approach to housing that a lot of cities have been taking, which only allow single unit houses, across most of the urban land that they have, and will now allow all kinds of homes of different sizes to be built across the state,” Matthew Lewis, with 'Califor