Xandar city - circular building

Gaelle seguillon gaelle seguillon gotg smallcircular concept art
Gaelle seguillon gaelle seguillon gotg smallcircular2 concept art
Gaelle seguillon gaelle seguillon gotg envtower concept art
Gaelle seguillon gaelle seguillon gotg buildingloda concept art
Gaelle seguillon capture2

As seen in the movie.

Concepts done at MPC for "Guardians of the Galaxy" for Xandar's buildings.