They were here first: Brazil, Russia, India and China. As the American dollar fluctuates, investors from around the world are staking their claim in luxury Manhattan real estate while the exchange rates are ripe and the market is supple with new construction. Back in February, the New Construction Manhattan blog reported that wealthy foreign investors made up approximately 30% of all Manhattan condo buyers. And as the market swings into the second quarter of 2012, the New York Times recently reported that a fifth contender has been collectively and silently sweeping up luxury condos in Midtown West. Here’s a hint: Whether you are observing the view from across Fifth Avenue or the Celtic Sea, the deals that these investors are making will have you green with envy.