His business is the treatment and fertilization of lawns.

If you open to the door to negotiations and don't strictly follow your lease you are setting yourself up for a serious precedent that may cause problems with other tenants (i.e. unequal treatment.)

The main challenge has been dealing with the state and other governing bodies in regards to the water well and sewer treatment plant.

Neither solution is particularly desirable, as both have undesirable income tax consequences.The sale of partnership interests are specifically excluded from tax-deferred exchange treatment under the rationale that a partnership interest is a personal property interest and not a real property interest, so more complicated structural solutions are required when partners desire to go their separate ways and some or all of the partners wish to structure and complete a 1031 Exchange."...

They want to stay because they think the foreclosure has problems and is not legal, but will NOT get an attorney to file a court case.Sometimes the occupants are renters and they get special treatment and have rights to stay for certain periods of time, check with your state's laws, it changes.   

The safe harbor provides that the IRS will not challenge the qualification of property as either replacement property or relinquished property, or the treatment of the accommodation party as the property owner under the like-kind exchange rules, if property is held in a qualified exchange accommodation arrangement (QEAA).

In general I think humane treatment comes down to intent and communication in situations like this. 

Once side, Attorneys and suits take time/effort but on the other hand, we have to fight for the unfair/unjust treatment, so they don't abuse others.

Add $1 for the ceiling treatment is reasonable.

One phone call solved the problem--DMZ and spot treatment--along with a squeeze of caulk in the space.Good Luck!