Check county auditor site for registered rentals, check sites like renotmeter that tracks a lot of rentals in areas.  

I've been a property manager for the last 8 years, Compliance Auditor for tax credit sites for 5 years and do have a current RE License.

Does the county auditor have a website?

I've noticed it done in the area, just looked on the county auditor site.  

I can sell the house quick for $50,000 (appraised for $60,000 on auditors site) with maybe investing $2,000 so I would have a 100% return on investment, (there are 2 people I now that are interested in buying right now).

The condo mapping process is very similar, and the risk is that the auditor could take the position that the taxpayer intent was to hold for sale and not for investment purposes. 

I looked on the auditors site and the guy bought it for $10,500 Dec 30.

The property is listed at $549,900 and it has been on the market for 1,176 days--it is also a foreclosure.The assessed value from the auditor's site is $290,000.Why the BIG discrepancy?

Check auditor site and see if they have a registered rentals section for the neighborhoods.Check zillow.com and rentometer.com to get an idea of current listed/rented rentals and prices in neighborhood as well.

If you do a little investigating on google searching for "Queens NY Auditor," you should be able to find what you are looking for.