You may need to get a sprinkler system done as well. First, get an architect who knows the most accurate building codes. Get plans drawn. Have them approved by the Building Dept. and Historic Dept. It takes alot of planning and time. You can get more information at the Building Dept. 4th floor at 30 Montgomery St. And also, go to Historic Dept. on 14th floor at 30 Montgomery St. for more information.
RE/MAX Villa Realtors
You should have an agent come in and prepare a CMA for you. Any agent can show you recent solds in the area, that compare to the unit you are looking at and tell you what is the actual price per sq. ft. If you need some assitance, feel free to give me a call.