Most likely without properly screening potential buyers to see if they are even capable of buying your home2- you can list on your own on streeteasy, loopnet, and most property websites you go to search for homes on.

It looks like they launched a pilot program in 2019 but costing homeowners up to $1M to do the conversion.https://citylimits.org/2023/03/13/in-new-yorks-fight-to-legalize-basement-apartments-what-about-cellars/I don't want to end up selling the place because it is good cash flow and would be even better once I renovate all the apartments.Thank you.

They'll fight for the best price and terms.

You will likely have to earn their trust at first so I wouldn't expect to have a lead after your first meetup but going there consistently and demonstrating your capability can lead to a deal funnel over time. 

You need to be personable, have great networking skills, be diligent, thick-skinned (lots of "no's on those cold calls), be capable when it comes to negotiating between seller and buyer.

If you think you are capable of doing what a REALTOR does, you've never experienced a difficult transaction.

Ideally, an agent and/or property manager experienced with out-of-state investors (I'm in NY), actively investing themselves, and capable of sourcing off-market deals for BRRRR opportunities.Thanks!

Does going into investment properties hinder the cash out refinance/HELOC capabilities in the next few years?

Do the tenants have any grounds to fight me on kicking them out? 

It's capable of generating approximately $200 per month in positive cash flow if rented out.