"Caldwell ticked off his accomplishments on affordable housing, such as the law on allowing affordable dwelling units on properties."

I think you mean "accessory dwelling units on certain properties." 

ADUs can be built on properties of at least 3,500 square feet. There are no "affordability" requirements. 

It remains to be seen whether the ADU ordinance will really help with the housing crisis or will just facilitate the construction of more illegal vacation rentals.