@Michael MorelliNew York State tax laws are more complex than South Carolina tax laws.Your SC return will be a non-resident return and include for the most part only your rental property from SC.Short-term rentals have a lot of similarities from their long-term counterparts...but also have many differences for tax purposes.best of luck to you in your search

Any suggestions on what resources I should be using and where to find the most accurate data?

Some complex K-1 packages will include a federal K-1 plus 10 state K-1's but in reality, there is only sourced income in maybe 5 states.

I am currently looking into purchasing an apartment complex.

I invested $25k into a 312 unit apartment complex as a limited partner last year, and I would never claim that I own 312 units.

That's true for typical recourse debt.But for the types of debt associated with larger deals, it's a bit more complex.

Thought this could be a cool post to show the areas where rents have been shooting up and more importantly HOW you got the rents there (what type of rehab). Feel free to add your own deals! 
Year 2017: I bought a 4 u...

MLS is too expensive, wholesalers tend to have C/D properties, Craigslist is dry.You guys ever use Prop Stream or other data lists?

I have found what I thought were deals only to talk to some local STR investors/management companies to find out that the AirDNA data is heavily inflated.  

Some are looking for their first deal while some others are syndicating apartment complexes.