TYRESE BUYS A MANSION!

Tyrese Gibson has got some serious negotiating skills, the actor just snatched up a spanking new L.A. mansion ... for almost a half a mil less than the asking price.

The R&B star closed on the Woodland Hills digs in July, dropping $1,038,750 on the deal -- but according to court docs obtained by TMZ, the original asking price was much steeper ... $1,499,000.

The 5-bedroom, 5,586 square foot Mediterranean-style palace -- built just this year -- comes complete with a giant tropical backyard featuring a waterfall, private pool, basketball court … and enough room for 10 cars.

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