Why Does this Say "The Harbor"?

While walking to Pitfire today, Pam and I were surprised to see the non-descript front at the north end of the building on the "northwest" corner of 3rd and Main open...



The interior once belonged to Mr. Fix It, but the door that was open was actually to the right of the old Mr. Fix It store front. Anyway, what caught our eye was the tile:



And what caught my eye was this at the entrance:



So historians, what was "The Harbor?"