You read that right: $500,000,000 as in half a billion dollars. What that impressive sum will buy you when the world’s first giga-mansion is completed this summer, is a 100,000-square-foot, 20-bedroom compound perched high above Bel Air on four acres, with spectacular 360-degree uninterrupted views. It’s the creation of movie producer turned prolific real estate developer Nile Niami and architect Paul McClean, who have taken six years to construct this ultimate spec-home. Among its multitude of jaw-dropping features; a 5,500-square-foot master suite, 30 bathrooms, a 30-car auto “gallery,” five swimming pools, a 36-seat movie theater, six-lane bowling alley, and naturally, a nightclub. As you might expect, when it hits the market it’ll be America’s—maybe the world’s—largest and most expensive private residence you can buy.

There’s a reason this jaw-descending 38,000-square-foot, four-story “spec” home, sitting high above Bel Air, is known as “Billionaire.” With its $150 million asking price, it will likely need a billionaire to buy it. But when this ultra-modern palace first hit the market in 2017, it stickered at an outrageous $250 million. Now $100 million less, its owner, QVC handbag tycoon Bruce Makowsky, feels the new price is more in line with the market. But what does the Billionaire mansion offer? How about two master suites, 10 VIP guest suites, 21 bathrooms, three gourmet kitchens, a four-lane bowling alley and a 40-seat 4K Dolby Atmos movie theater. Outside, there’s a 17,000-square-foot entertainment deck, an 85-foot glass tile infinity pool and, wait for it, a garage filled with $30 million worth of exotic cars.

This is where Some Like It Hot star Tony Curtis, along with singing duo Sony and Cher, once called home. Before them, Joe Schenck, chairman of movie studio 20th Century Fox owned it. Now this sprawling, 10-acre slice of Old Hollywood, on South Carolwood Drive in ritzy Holmby Hills, is on market for $115 million. That’s well down from the original 2017 asking price of $180 million. Built back in 1936, the Italian Renaissance-style wood-paneled mansion features nine bedrooms and 10 baths spread over 12,200 square feet. In the vast, beautifully secluded grounds there’s a tennis court, an Olympic-sized pool with spacious pool house and four garages. And with the compound being made up of three contiguous lots, there’s plenty of room for development. Even for a small sub-division.

Entertain on a grand scale in this romantic Hollywood Hills Villa with distinctive old world charm along with canyon/city views. Massive patio/pool space creating an indoor/outdoor flow from bar/entertainment rooms, gated with an abundance of parking, soaring ceilings throughout. Overlooking Los Angeles from a lush green knoll, surrounded by tree tops Villa Fiona offers privacy and tranquility while being just minutes from the city.