Heck, when used properly the higher the better!

It requires you to model through the exit of each asset, which is a best practice, in my opinion, to be able to properly benchmark investment opportunities and allocate personal capital.  

The amount you can increase rent on vacancy is a function of both current rent as well as the length of time it has been since the last new lease was issued, plus of course getting the current tenants to vacate/not-renew. 

So now that you are the new owner, those liens are now YOUR responsibility to pay off, with a potential exception being IRS liens (with proper notice of the sale, the IRS has 120 days to redeem). 

If anyone can help me to find the proper form for an assignment please do so.  

If installed properly it should last a long time.

Unless there is money at M&D bank (Mom and Dad), you should be working with professionals that understand how to properly assess their risk.

My midlife crisis:I never got my degree and I never joined the military so I lack a proper education.Former FSBO.

To ensure everything is done properly, run it through a title company.

This should be a case by case basis depending on the condition of the system and if the failure to perform regular maintenance was a contributing factor.Note:  For HVAC the Trane warranty states that they can request documentation of proper preventive maintenance.The other option is to buy an extended warranty through a third party reputable, financially sound, reseller like "Squaretrade"The last option is to buy the house and Not the appliances and HVAC\Heat System and rent the appliances from the original owner.