. >> reporter: sean murphy, with the marina says they plan to build 760 apartments and condos . here are some before and after pictures. now, before they can build housing, they will have to fix the seven-year-old seawall, which has fallen apart. >> if you look in, it opens up about six feet and goes all the way to the water. so, that makes this entrance to this stock untenable. it is not safe. >> reporter: the mayor was reluctant to support the project at first, but once the developers agreed to spend tens of millions of dollars to build a new seawall, at about 100 affordable units, and turn another 30% into workforce housing for middle-class families, she signed off on it. >> for me to put my name on the project, i really needed to have what i consider significant and if it to our community. >> reporter: also, developers agreed to renovate a dock for public use, and build a trail that will open up the marina to the public. >> the proposed housing in the background existing with historic buildings that we will repurpose. to see this new seawall, that does not exist today. that