With global warming and all the crazy weather we are having, I would question the wisdom of such a move. Of course, that’s my Left Coast brain talking. However, were you to buy the park based on the value of just the homes outside the floodplain, then it may be worth going for. I could easily see you not being allowed to rebuild any part of the park that gets flooded out in the future. Floodplain maps are being redrawn all the time so it might be a good idea to see what changes are in store for your area.