The Comptroller may not issue a certificate of registration to a retail service station dealer who markets motor fuel through a retail service station altered, enlarged, or structurally modified after July 1, 1977, unless: the station contains an enclosed work area where the service of motor vehicles is offered to customers regardless of whether motor fuel is bought; and the services offered include a battery charge, lubrication, oil change, tire repair, and replacement of accessories such as fan belts, radiator hoses, or wiper blades. Notwithstanding subsection (a) of this section, the Comptroller may issue a certificate of registration to a retail service station dealer who markets motor fuel through: a retail service station that, before it is altered, enlarged, or structurally modified, lacks an enclosed work area; or a retail service station that is altered, enlarged, or structurally modified if the owner and retail service station dealer agree to the elimination of an enclosed work area.