I hired an inspector to do the due diligence and have contingencies based on appraisal and inspection.

I'd make the offer contingent on them signing leases or vacating before closing.

Make your offer contingent on your inspection and on you obtaining financing, and give yourself a fairly generous inspection period (15 days is recommended by most).That way if you or your potential buyers go over the house and decide it's not a good deal, you can back out saying it didn't pass your inspection...

Do you have any contingencies in the offer if you are not available to find financing?  

@Shaquetta Chittams Do you have a financing contingency?

@Conor McAleer In order to get an offer accepted on a listed property that is priced right you'll need an all cash offer, with no contingencies.

I might make the offer on one of the properties contingent on the other property accepting your offer as well??

I know that buying auctioned/foreclosed homes don't allow contingencies....but at these prices,  the risk might be worth it especially for the newer properties.

I had someone offer me $200,000 contingent upon me knocking down the structure and removing the oil tank. 

Sometimes they have a set date/time scheduled to view offers and sometimes they review offers and submit them as they come in. 2) Offer with zero contingencies if time allows.