The East office (東側オフィス Higashigawa ofisu) served as the RPD's detective wing, as referenced in the Resident Evil Archives.
In Resident Evil Outbreak File #2, players will start the "Desperate Times" scenario here in Normal Mode. Marvin's office is also here. He has a meeting with other officers here to escape.
In Resident Evil: The Darkside Chronicles, Claire and Leon run through the office on their way to the roof.
In Resident Evil: The Umbrella Chronicles, Jill and Carlos come through to go to the basement.
East office in Desperate Times from RE:Outbreak File #2
Kevin in the East Office.
East Office from The Umbrella Chronicles
East Office in The Darkside Chronicles
East Office - Resident Evil 2