Where online can one find opinions and data regarding NY City real estate?

Hi! Thanks for the question.

The Housing NYC website is a great resource for any information about
real estate in NYC.

Articles

Housing Resources  
http://www.housingnyc.com/resources/resources.html

Rent Guides
http://www.housingnyc.com/guidelines/guidelines.html

Apartment Guide
http://www.housingnyc.com/guide/index.html

---------------
Research Reports

RGB Reports
http://www.housingnyc.com/research/cresearch.html

Housing and Vacancy Survey
http://www.housingnyc.com/research/hvsresearch.html

Other Housing Reports
http://www.housingnyc.com/research/othresearch.html

Search terms used:       
"New York City" "real estate" industry
           
I hope these links would help you in your research. Before rating this
answer, please ask for a clarification if you have a question or if
you would need further information.
           
Thanks for visiting us.            
           
Regards,            
Easterangel-ga            
Google Answers Researcher