Check with your lender and what they would require.Think of everything you can to make it win-win for the buyer. 

Also putting a business card and flyer on the door could work.

Quote from @John Friendas: Quote from @Chris Seveney: When buying at auction you will have zero ability to sue (and win) an auction site if information is not correct.  

Nerds win! 

., taking on deferred maintenance or providing a quick, hassle-free transaction).Win-Win Mindset: Emphasize how the sale could help the organization, such as freeing up funds for its mission or relieving the burden of maintaining a distressed property.4.

I also use their virtual credit cards which enables me to assign a card to a specific person, like the cleaner for my STR for example, so when she runs a charge, it automatically drops into the right account in terms of categorizing my expenses.

We use the AppFolio system that allows for credit card payments, ACH, etc. 

BTW there is a free trial and the Starter monthly plan is $119.It also allows you to search through consumer information such as property owner "credit worthiness," Credit card usage, buying power, age, language, family members in the house, and many other fields that are above and beyond property characteristics, which is unique.

But it feels like if you keep cashing out equity on your properties to buy another, you end up with multiple properties but with your equity stretched really thin, like a house of cards ready to collapse. 

Start small and get a win under your belt.