Buying an apartment building in Brooklyn, New York

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Hi,

My name is Phil and I am new to real estate investing in the US, although I own property in Bermuda where I live.  My adult daugthers' live in Brooklyn, NY where they rent an apartment and I'm investigating whether it makes sense to buy an apartment building, as an investment, in which they rent a unit rather than pay rent to someone else.  I have listened to Brandon's Beginners Guide to Real Estate Investing which i found extremely helpful, but have been unable to find a site on the internet that lists apartment buildings for sale.  I could contact a local real estate agent, but would first like to understand the various types/ sizes of aparment buildings on the market, their costs, locations, financing options, etc.  I would very much appreciate any information one could offer.

Many thanks,

Phil