You also have to keep in mind that residential tenants in properties like this tend to complain about the noise level of the businesses downstairs.

How to handle noise complaints and what stipulations should I put in the lease?

You must provide proper trash containers for renters.Excessive noise is prohibited and violators are subject to fines and penalties.The owner or their designee must provide contact information to the renters.

The people that broke through the noise for me, brought a legit offer, meaning the numbers were in alignment with the market and they backed it up with a written offer the same day.     

Is there road noise?

Some people prefer not to have someone living above them, so would deal with an additional flight of stairs to avoid the noise.

The other issues are liability, if there is a fire/safety issue/problem tenants/noise complaints/etc. and the people you have renting out those spaces or your neighbors, find out they are not permitted, they have you by the balls.

Maybe it's changed, but a year ago those pages were full of non-investors or beginning investors that gave a ton of bad advice and it was too much noise. 

Sry took a few days to respond back, been busy days at regular 9-5 grind.

Do listen to their complaints and maybe grind down the high spots for $500 and ride it out till they leave, while budgeting for the repair.