It's not uncommon to have backup offers submitted, but to actively negotiate is not.   

What are some uncommon items for lease that I should think about adding in (i.e.

Cash up-front is not uncommon and some offers even waiving an inspection. 

It's not uncommon.   

Since it is under 14 days rented we are being asked to file this under "uncommon income" or "other income" instead of schedule E.  

If so what will be some pros and cons when it comes to buying a property where the owner has to pay for the utilities in your opinion I hope you are all good, I appreciate you a lot .This is not uncommon and it's not a big deal.

This is especially true with the larger homes being placed on these lots.  3 car garages, >3500’ living space is not uncommon.  

It is not uncommon to have a 7 day turn around for those.

She is a very conscientious person who puts considerable effort into upholding her responsibilities.She repeatedly reports having landlords, (her clients,) bypass her position as property manager, going directly to tenants and/or contractors.In addition to reducing her income, this is, naturally, difficult to work around, and is also going to happen again.Being that this isn't uncommon, has anyone on this forum come across some contract clauses which anticipate this happening, and lay out procedures for handling this problem which are satisfactory to both property managers and landlords?

. :-)This isn't uncommon and shouldn't be a problem.