So according to the tax maps, everything south/west of Commercial Street is zoned Waterfront Port Development, which explicitly prohibits residential, hotels, and restaurants. And almost all of Cassidy Point is owned by the Sprague Corp. or Cianbro.
BUT there's
an interesting and quite large empty lot just across the intersection of Cassidy Point and West Commercial, with frontage on Danforth Street, that's zoned B-5 – which is designed for "a mixture of uses, including marine, industrial, commercial, and a broad range of residential options, is encouraged. The B- 5 zone is characterized by larger underdeveloped lots with great potential for dense, clustered, urban mixed-use development and reuse of existing land and buildings."
The owner is JB Brown, which recently hired Tuck O'Brien as a developer – Tuck used to work for the city and I know he's interested in building more housing. Could be a promising partnership...
A relatively tiny corner of this lot is currently occupied by the Clam Bar, which looks like it has
a lease on the property, but there's plenty of room to the west for two or more larger buildings.
This is also another spot where it sure would be nice if the State of Maine and/or City of Portland could help by ceding some of its unused highway right-of-way on Commercial Street to help make the lot more develop-able. For some reason, the ROW widens right at the Cassidy Point intersection, and takes a big bite out of this parcel.