There are several options for skip tracing to find phone numbers and email addresses.

Has anybody found a workaround for this or would the seller simply have to hold the note long-term without the option of selling it?

You really to examine your options with everything and be very choosy who you let run it for you!!! 

Use extended closing periods or additional earnest to buy more time for your old property to sell if you need.The last option is what's called a reverse exchange.

If you come to the conclusion that you need to focus on your primary earning job but want to start investing in real estate then maybe a turnkey option would be best.

You have options!

Account Closed a PMC has two options to get liability insurance (tenant slip & fall) protection:1) Get added to owner's policy as Additionally Insured (NOT named insured).2) Setup a master commercial policy and add every property they manage to it and then charge those owners the cost of the policy.Otherwise, a PMC CANNOT get liability coverage on a property they have no ownership interest in.So, nothing wrong with their request.

There are a lot of options out there.Some of the most useful items BiggerPockets members have identified are features that save time so they can spend time working on their next property.

While you work on that, you could also explore creative financing options like DSCR loans or partnerships to fast-track your first STR.

So many better options.