David Letterman will have two series premiering on CBS this summer, with the network confirming a pickup on “The Building,” a prime time sitcom on which Letterman will serve as an exec producer.

The show, which is being produced through CBS Entertainment Prods., stars Bonnie Hunt in an ensemble comedy featuring several Second City alumni playing young adults living in a Chicago apartment building.

Hunt, who wrote the pilot, joins Letterman as exec producer.

The show marks Letterman’s official entry into prime time series as a producer, having previously produced an NBC pilot a few years back — passed on by the network — that was to star comic Jeff Altman. He also exec produces “Late Night With David Letterman” through his Worldwide Pants Inc. (also credited on “The Building”) in association with NBC Prods.

In addition to his own late night series, set to premiere Aug. 23, Letterman’s reported three-year, $ 42-million deal with CBS calls for him to produce a companion series, though the parties have stressed that the second late night show isn’t an immediate priority.

Showcasing its lineup to local media buyers Wednesday, CBS also announced a pickup and summer premiere for the Warner Bros. TV sitcom “Tall Hopes,” starring comic George Wallace as the father of a top high school basketball prospect. That show comes from former “Head of the Class” producers Rich Eustis and Michael Elias.

Other original CBS programming will include the western series “Return to Plum Creek” (nee “Ned Blessing”) and news magazine “Eye to Eye With Connie Chung ,” which premieres June 17.