I've done a couple of direct loans, but for the most part, I work with a mortgage broker who brings deals to me.

Usually the hardest part is coming up with the down payment.

One thing you might think of doing is having and promoting your own website to avoid the exhorbitant fees charged by the third party sites such as Expedia, Booking.com and Air BnB.  

However, in order to preserve the constitutional status quo while the merits panel considers the parties’ weighty substantive arguments, that part of the motions-panel order granting the Government’s motion to stay the district court’s preliminary injunction enjoining enforcement of the CTA and the Reporting Rule is VACATED.”  

It was a great niche for many years, but that market has mostly disappeared with legalization of pot in CA, which has pot prices crash.I have also used seller financing in purchasing REO and other real estate purchases and these have worked out really well for all parties.

You will want to consult with a lawyer.In regards to your last two questions here's some background on what makes a contract valid and enforceable:Offer: A promise to do or not do something within a certain time period Acceptance: A clear and direct statement that all terms and responsibilities are accepted Consideration: A legal and adequate inducement given in exchange for the promise Capacity: The parties to the contract must have the legal capacity and competency to contract Awareness: A party must be aware of the contract Legality: The contract must be legal in the jurisdiction it will be operating in***Not legal advice*** Steps I would take: -Review contract in detail to understand each counterparties responsibilities (if you are not aware)- Email a copy of the lease to each of the tenants listed on the lease and reiterate lease expectations for termination notice, rent payment etc. - If the lease was signed via Docusign (other esign may have same ability) - you can go to the envelope, go to history and view the IP addresses for each action taken.

We use a third party servicer to do all of this - much easier and when starting just tracked payments in wuickbooks as servicer tracked everything else 

HUD recently has been liquidating these properties and the notes sold to 3rd parties.

She's not going to have any leg to stand on in court if you get that far unless there's some explicit language prohibiting the owner from assigning responsibilities to another legally authorized party, and I'm guessing there isn't if another PM company was maintaining the lease and provisions - and the fact that the tenant was voluntarily working with the other PM confirms the acceptance of an authorized agent even if it's not explicitly stated, the same way if you accept rent from a tenant after a lease expires you imply acceptance of the lease terms continuing (which is why you should always have a holdover provision). 

They don't tear things up, they don't party, rent is generally paid early, lots of positive attributes!!