I do not think it is unreasonable to require a single payer and change it over. 

Let me know if I'm being unreasonably conservative or what. 

Let your buyer know that the seller may be unreasonable to closing might be rushed as soon as everything comes in, they sometimes aren't the most rational people. 

We vet our tenants very thoroughly, however, this person's personality changed over the times, and is being unreasonable.

Does this seem unreasonable?

Property owners who refused to allow either the rental or point of sale inspection were subject to fines and possible criminal prosecution.The lawsuit, which was filed on behalf of several property owners by the 1851 Center for Constitutional Law, a non-profit entity, alleged that because the inspections were done under the threat of criminal prosecution, the ordinance violated the Fourth Amendment protection against unreasonable searches.

If you add Billing Service fee and taxes $50.00 is not unreasonable.

If she is helping grow another person's business by bring in referrals, then it would not be unreasonable for her to want to get some help in return.  

having money for the deal vs... just buying smaller multi family property and then after getting that first deal... looking for other investors who would invest with me....)But it is also unreasonable to expect a sponsor to invest sizeable chunks into every project.

A request for a reasonable accommodation may not be unreasonably denied, or conditioned on payment of a fee or deposit or other terms and conditions applied to applicants or residents with pets, and a response may not be unreasonably delayed.