I know Edgewater pretty well; I happen to own a couple of rental condos along Sheridan Rd in Edgewater.
With that said, the question your asking, though specific in its details, leaves out one important element: The Building.
As you know, there are a kajillion high rises along Sheridan Rd. in Edgewater, most of them pretty old and with units in need of updating. The square footage you speak of is pretty typical for a unit your size, but without knowing the building, it's hard to say whether or not you got a good deal.
Based on recent sales along Sheridan Rd. in Edgewater (which, if you say "beach front", I'm assuming is where your building is located?), I can tell you that the average price was in the high $300's to mid $400's, so it seems that you probably got a good deal. But to tell you unequivocally "yes" would be hard to say without knowing the building.
The size of your assessment is pretty huge, even for the square footage, so you are either on a very high floor, or you bought a unit that was once 2 units and combined into one....?
As an Edgewater owner, I'd be curious to know the building in which you bought!
Sorry I can't give you a more specific answer.