Most people will be thrilled to sell their formerly mostly worthless ill-maintained property for an inflated price.  Nobody is proposing imminent domain; those that want to stay certainly can. Higher property taxes are likely on the horizon, but on the other hand this low quality housing stock has been disappearing by attrition and conversion to commercial for years since the economics of rehabilitation with the current state of the neighborhood don't support improvement.  Nothing can stay the same forever.  Neighborhoods go through cycles even without the dramatic spectre of getting rid of a mammoth eye-sore like the viaduct while adding a beautiful park and dramatically lowering noise levels with a below grade freeway.