If I were doing a remodel that expensive, I would want ONE company with the three disciplines do the drawings AND the work.

Matter of working together---the HVAC guys need specific room, the plumbing often has to work around the HVAC, and the electrical has to avoid both.

If the designers work for the same boss---and the workers work for the same boss as the designers---the one boss makes sure all the above do the best job.

Thank you handymac. However that is not an option. I should have mentioned that the apartment is in a high rise and that everyone has told us that we should stick to companies that have already done work in the high rise. So, we haven't heard of a company that does that with experience in our building. Hopefully, the contractor will make sure that all the subcontractors work together.