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Jay-Z is keeping a close eye on his multimillion dollar NBA investment — showing up to a Brooklyn construction site to check out the future home of the Nets … and even trying his hand at some hard labor.

The rapper toured the dirt-filled construction yard on Friday — known as Barclays Stadium — to take a gander at where his Brooklyn Nets will earn their stripes … as in black and white, ’cause the team’s colors just changed too.

Oh yeah, TMZ got video of Jay-Z careening around the construction site on a bulldozer — reaching breakneck speeds of approximately 1 mph.