Facebook for-rent groups, city website postings, and newspaper classifieds are probably how you’ll find other units for rent in the area. 

@Franco Vanderka the list of tax delinquents is in the Suffolk County news paper .

Stay healthy, stay away from bad people.Some ideas to find the deals:walk/drive neighborhoods, look for neglected propertiesadvertise, newspapers, radio, pass out flyersWrite a nice letter to landlordsWhen housing court starts up again, meet landlords there - chatCall and visit owners of Expired Listings - make offersBuild a relationship with a few Realtors, offer to pay them a fee (3-5% of purchase price for unlisted buildings) for presenting your offers to FSBO's and expired listings (auto pilot investing) The purpose behind this is to open negotiations with sellers, I always offer well below their asking price BUT IN WRITING hand delivered by an agent (you save time, cost of gas and you increase the odds of finding a fat equity deal)Study Real Estate Control techniques; delayed settlement, assignment clauses, all types of options, hybrid or JV with sellers, repair consideration with possession (known as front porch offers) use one of the 21 proposals for seller financing (the best highest leverage financing you can get)My LOCK-DOWN has proven to be profitable, I have time to network and develop clients nationwide to mentor/partner transactions.

@Christine Kankowski when I first entered the business, we spent $15 a week for a newspaper ad and thought nothing of it.

OTOH 20.00 per month compared to newspaper prices loooong ago is cheap.With said my thoughts have been turning to a concern....about the response rate. 

If you have your property under an LLC you cannot DIY represent yourself anyway.Also,  consider approaching your local media outlet or writing a letter to editor of newspaper and contacting your representative government officials to let them know that you are a landlord who has a tenant who is able to pay rent but has taken advantage of the terms of the emergency eviction moratorium and refuses to pay rent.   

cold call the owner/owners, drive around looking, mls/realtor, local newspaper, craigslist. plenty of options. 

I subscribe to one agents email MLS notifications set for my parameters, then scan the local newspaper for foreclosures, visit the county courthouse weekly (pre COVID) for listings, monitor several auction sites and if I'm driving locally I call the # on many sale/rent yard signs to understand pricing.

I take a pic of the foreclosure listings in the local newspaper, then go to the courthouse to monitor the files of interest during the outbid period.  

I read the knoxville newspaper and I read it everyday to see if the new foreclosure list is available.