The match opened up and Carson saved from point-blank range from Henry after a dreadful mix-up in the Charlton defence involving the goalkeeper and JonathanFortune.
"If you look at the location, you've got major law firms and Fortune 500 companies who want to be there, " said Jonathan Bennett, director of real estate for Nakash.
Birmingham's Chris Wood and Doncaster's Sharp sent headers wide before Fortune looked destined to score his first Rovers goal only to be denied by Jonathan Spector's last-gasp tackle.