It is good practice to establish a pet policy and procedure and a service animal policy and procedure prior to encountering the need.See: http://www.mvfairhousing.com/ServiceAnimalPolicy.P...An example from our rental agreement of a clause that has proven useful:"PETS AND ANIMALS.This agreement specifically prohibits keeping pets/animals, or allowing the pets/animals of others on the premises, even temporarily, without the prior written consent of Landlord.

You cannot contract for a seller to provide financing and assign that contract without the seller's consent.

First, I suggest you modify your machine lease providing access to the premises and retrieval of equipment with the consent of the leasee in the agreement.Next, the landlord can't go in until the eviction, until then the tenant still has their rights.

To change your accounting method, you generally must file Form 3115, Application for Change in Accounting Method, to get the consent of the IRS.

You may get a special use permit without having the zoning changed if your neighbors consent.

You also can't force your seller to finance to a third party without consent, it's required for unilateral contracts.

That said, in any group-sponsor investment there is exposure to market risk and sponsor quality.Your challenge lies in the TIC's unique feature of requiring unanimous consent. 

Does the original owner consent to do this because they can no longer afford the house and want to avoid foreclosure?

I wonder if altering a document without the other parties consent like this is legal?

A financing contingency cannot be assigned without consent of the seller.