Business Portrait Location (Istanbul)

I am looking for a suitable location to shoot some executive portraits-
I need a few different angles inside and out with backdrops of modern office buildings architecture etc;
No doubt Levent area offers the right potential but am pretty sure getting permission or hassled by security will not make it realistic.
Any suggestions?
Do you have a modern office I could use-perhaps with a Levent type view of the business district of Istanbul?
Am happy to shoot some images in return.