Tag buildings from previous import as buildings, clean up some errors

Import buildings in Williamsburg, VA. I only kept buildings that had start_date tagged by the city. I also cleaned up a bunch of duplicate nodes, etc.

Import buildings in Williamsburg, VA. I only kept buildings that had start_date tagged by the city. I also cleaned up a bunch of duplicate nodes, etc.

Import buildings in Williamsburg, VA. I only kept buildings that had start_date tagged by the city. I also cleaned up a bunch of duplicate nodes, etc.

Import buildings in Williamsburg, VA. I only kept buildings that had start_date tagged by the city. I also cleaned up a bunch of duplicate nodes, etc.

Import buildings in Williamsburg, VA. I only kept buildings that had start_date tagged by the city. I also cleaned up a bunch of duplicate nodes, etc.

Import buildings in Williamsburg, VA. I only kept buildings that had start_date tagged by the city. I also cleaned up a bunch of duplicate nodes, etc.

Import buildings in Williamsburg, VA. I only kept buildings that had start_date tagged by the city. I also cleaned up a bunch of duplicate nodes, etc.