Single family home.Home is already tenanted but I found it very stressful to work with my current property manager, I was being charged expensive fees without my consent. 

In the meantime, the National Apartment Association has some decent recommendations around the laws that are helpful: While you do not need written consent to send a resident an informational text, we strongly recommend that you obtain written consent for both informational and marketing texts for several reasons.

Just make sure you have consent to receive certain sensitive info from your tenant in your area.Good Luck

This should never ever occur without consent of the individual with the contract.

I rent 2 SFHs as dorm units to college kids, it has been good for me, the key is to find groups that rent out the entire floor, don't typically put strangers on 1 floor unless everyone consents.

One party means you don't need him to consent to recording your interaction. 

Hannah, don’t feel bad about holding them to the legal agreement they consented to.

@Jingru Sui instead of a master lease I basically created my own rental lease that includes written consent to sublease, home modifications, and a few things that were relevant to my objective.

In Massachusetts, there is a possibility of "dual agency", where an agent can represent both buyer and seller, but only with the express and informed written consent of both buyer and seller.

Sure as long as the owners consent, which I can't imagine why they wouldnt.