Finding a condo that allows Airbnb/STR will be challenging, they're rare and cost more because of it. 

The full 5 year proforma is free to give you a good look at what to expect on the deal.

free standing subway?

I would recommend getting a free cost/benefit analysis to see if you specifically could benefit from the study.Real Estate Professional Status

If you are looking to buy in PA, its possible you can qualify for PHA KFIT program that gives you a 5% closing cost forgivable loan.

I responded to you because I genuinely am trying to help you (for free).

Imagine if it cost 1000 to send out 50 letters but half of them responded and half of those wanted an offer and half of those accepted an offer and half of those closed and half of those resold for a net 50k. 

Simple does NOT mean "easy" or pain free. 

% rate buy down, closing cost seller credit,  lower sales price ?  

These platforms typically have billing policies where you pay a per unit fee per month to the software and you get regular updates and support each month.There are a number of low-cost platforms available that are able to offer you a lower price by passing along some of the costs to your tenants (payment processing fees, applications, tenant screening, etc).