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'Real Housewives' star Lea Black is ready to part ways with her jaw dropping Hollywood Hills mansion where she's entertained A-listers, politicians and power players for years ... TMZ has learned.

Real estate sources tell us the 4,500 square foot property -- perched above the Sunset Strip on a rare double lot -- is currently off-market, but being prepped to list for around $7 million.

This place is built for entertaining ... wall to wall glass puts the city on display from every angle, and the Black's added a swanky bar and entertainment lounge, along with an outdoor kitchen and chef's kitchen ... all spilling right out to the resort-style pool and spa.

Outside, a massive patio with high end audio and lighting, plus a Porsche designe

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