I would second Rainydays advice on this investment.
In particular you need to look at the tax implications of owning and renting out a property in New York. There are local city, state and national tax considerations. In addition, once you earn any income within the US the IRS (US Revenue) will require full tax returns every year and will try and get as much tax out of you as possible.
To be honest, Brooklyn isn't that great an area - a lot of it is quite industrial and run down and inhabited with a large proportion of lower income families. Traffic can be a nightmare and its on the over flight path to La Guardia airport.
For the kind of money you are proposing to spend (approx $700,000 based on today exchange rate) you should be able to get an apartment on Manhattan which would have a much better rental return - I did a quick search on [broken link removed] and found a 1.5 bed apt on 81st Street (Upper East Side) in an apt complex with doorman for $635,000 available immediately. Rental return on a 1 bed in the Upper East side is around $3,000 per month.
I think you need to do a hell of a lot more research before spending that much money on an area you don't know.
efm