Consider pets.

I certainly recognize that this is the "Cost of doing business" when you allow animals but I have had previous pet owners with little / no issues. 

Therefore, it’s usually best to have a written rental agreement.However, even if the agreement is oral, the landlord must give you a written statement regarding the name, street address, and phone number of the landlord or agent for receipt of legal notices; the contact information for the person who is to accept the rent; and how the rent is to be paid (for example by cash, check or money order.)It's especially important to have a written rental agreement if your tenancy involves special circumstances, such as any of the following: You plan to live in the unit for a long time (for example, nine months or a year);Your landlord has agreed to your having a pet or water-filled furniture (such as a waterbed); orThe landlord has agreed to pay any expenses (for example, utilities or garbage removal) or to provide any services (for example, a gardener).

Think of all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

We also charge for early check in/late check out, pets, dock usage where available, and pool heat where available. 

Refusing to accept pets severely limits the pool of renters around here.

There are just a lot of legal loopholes at the moment that will need to be resolved before the slow down effort gets some teeth.

well first of all, Service animal and pets are house broken.

Both tenants have pets and I want to make them no pet units.  

One unit makes teeth one unit is a office with a warehouse one unit is a software company.