The Daily Herald reports that Columbia, Tennessee, will buy and raze eight blighted homes with a $500,000 grant from the Department of Housing and Urban Development (HUD), and install four modular homes intended for low-to-moderate income residents to buy.  Each home will have three bedrooms and two baths, and will be built by Modular One in Pulaski, TN.  Part of the grant money includes $10,000 to help the families who buy the homes with the down payment.  These funds will be forgiven if the family remains in the home for at least five years.  The other provision is that the family cannot make it a rental unit.