HD means historic district
B means business
R means residential
O means ocean. It is the first two beach blocks and permits single family homes, old hotels, and new hotels, but the hotels cannot be implemented due to the high property area requirements. This is the zone where the North End Redevelopment Plan lives
Is the HUB a business? Sells things but not in business district.
The whole town is historic district, HD.
Note B – only certain areas are for business.