I am imagining the swamp almost like a flooded forest with stands of mangroves and intentionally managed, not over populated fish farms. Kelp farming is another possibility and if there is enough ground water pressure to keep the saltwater out, maybe even rice paddies.
Houses that built with dolphin pylons (build a water tight shell that is partially submerged and not attached to the foundation conventionally but on pylons that allow the whole house to rise up and down with the tide and sea level change. Do away with streets entirely until you get to semi-stable dry land and use sustainably powered boats for travel.
These houses have their temperatures moderated by the water they are in. (Which could be a bad thing as I recall the ocean has been at bathwater temperature recently