Spend the $100 to download a list from Listsource/Costar where you can set parameters of your choice (area, LTV, time in home, type of building,...etc). 

Thanks Karen - Everyone seems to use different tools, good to know there are so many choices. 

Are there any alternative strategies I can use to get a hold of these people?

Your best option is to get with a rockstar LO that has your best interests in mind to help educate you, work through all the different options, so that you can make that choice for yourself effectively.Best of luck!

The question I have is when I bought the home I only lived in it for 1 1/2 to 2 years before I got permanently stationed somewhere else, during these last 8 years I have rented it out and have not lived in it, will I have to pay capital gains tax seeing how I didn’t live in for the last 2 out of 5 years or am I protected because I had official orders and had no choice?

A sometimes quicker cheaper alternative is the cash for keys approach.

As @Michael Ablan mentioned, depending on your state regs (places where rent increases aren't regulated so heavily) the general rule of thumb that I use when increasing rents is this:1-5% increase: keeps up with inflation and generally not enough to force a tenant to move.6-10% increase: tenants will start to weigh alternatives and will consider moving.

If the realtor ever has off market deals before MLS, I might not always be their top choice.

Is their an alternative to sell the ADU by itself?

It seems like a lot of the recommendations for the wording to use on postcards and letters are strongly based around being able to offer cash and close fast. 
Has any one experimented with listing some of the more cr...