Napa Valley Register: It’s back to square one for Napa’s historic downtown post office.An offer to buy the earthquake-damaged building has fallen through and bids are once again being accepted. Even faced with the costly task of redeveloping a historic building, the city and those familiar with the project remain optimistic a new buyer can be found.According to Gus Ruiz, United States Postal Service spokesman, as of late March a buyer had made an offer and was taking the time to “kick the tires” and review the property.However, after doing so, “The buyer terminated the contract,” said Ruiz.He did not elaborate on who the buyer was, how much the buyer had offered for the property or why the bid was withdrawn.  Read more.