Dear new Red Sox players Yoenis Céspedes, Allen Craig, Joe Kelly, Eduardo Rodríguez, and Kelly Johnson! Welcome. As your very, very unofficial greeter to Boston, we’d like to help you get situated as quickly as possible. We realize you just got here and there probably isn’t even dirt on your uniform yet, but it’s never too early to start looking for a place to hang your mitt at the end of the day. We’ve rounded up a few mansions and penthouses that are currently on the market in the Greater Boston area. Take a look and happy house hunting.