Rose receives an offer to buy her building from a real estate magnate whose plan to renovate means tearing down 227.
In order to insure the success of a big construction deal, Lester swears Mary to secrecy about the identity of his famous houseguest/investor, the Marvelous Marvin Hagler, an effort that nearly sends Mary down for the count.
Unimpressed with Brenda's wisecracking history teacher, Mary has words with the school principal.
Mary throws a surprise birthday party for Rose but Rose has an even bigger surprise when she announces she has sold the apartment building.
