At least they will have a place to eat... As if there are no cafeterias in the building for the 6,000 employees. Perhaps, you've never been in any of such buildings. THat is fine, but you should refrain from forming an opinion, then, about things you do no know.
Your attitude suggests that the rumors of traffic jams justifies the taking of private property. "Rumors" in such cases are based on studies.
And, yes, it is important to buy our a private property when public interests predominate overwhelmingly. Eminent domain should be exercised conservatively, but you seem to be against it totally, which is ill-founded. Takeing private property to give to other private interests (and chargeing the public for the expense) is just wrong.
Constructing an access to a new high-rise office building hardly seems like it meets your standard of "public interests predominate overwhelmingly." The developer should have planned for the road and secured rights to it through the market.