What does RD 1.5 zoning allow in LA?

RD 1.5 zoning means that you can have 1 dwelling per 1500sq ft. So if you had a 2999sq lot, you could only have 1 dwelling. If the lot was 3200sq ft, you could have two. RD 2 is 2000sq ft RD 4 is 4000sq ft, etc...