So they use a standard Madison Avenue Remailer. A lot of companies do this. If they are a startup or have offices in rundown parts of town. Sometimes they run business out of their homes. Other times they just want the prestige having a Madison Avenue office gives them.
I dealt once with a very reputable venture capitalist, he was a certified millionare and used a remailer like this. As he explained it he had a couple houses and by using a remailer he would have his mail and packages forwarded to where he was. This allowed him to have one address yet be flaky about where he was at any given time. Registered letters that have signature verification would need to be signed by the recipient who wouldn't be there at a remailer. Suite 302 is an architecture firm. The remailer probably lets them use 301 too since all they really need is the address.
It isn't any big deal. It just means they don't have a huge corporate office (did anyone think they did?).