I have heard that it is illegal to text someone if they did not consent to receive texts from you.Is this true?

Possession acquired without consent is still a property right which the law protects.

Its not like they do short sales without the homeowner's consent. 

And my lease agreement expressly prohibits subleasing or assigning the lease without my prior written consent. 

You perfectly highlighted my point how informed consent of choice is being removed, under a fake auspice of safety for those who do not condone those actions.

When do you need unanimous consent? 

Is it permissible to obtain a credit report on a borrower without first getting their consent? 

My wife is worried that offering, and negotiating a property for sale without the knowledge or consent of the other owners is fraudulent and that I could be found guilty of selling real esate without a license. 

But you can also apply on the tenant’s behalf (but you’ll need the tenant’s consent to do so).

We use a revocable trust to accomplish that.