This mansion in the mountains above Beverly Hills was purchased by Anton Zaslavsky, better known to millions of electronic music fans as Zee, for $16 million five years ago. The German prince’s offspring from Russia is now trying to unload the temporary residence for an eye-popping $26.5 million. The rise in price reflects the introduction of high-end amenities such as a soundproof movie theater and a fully stocked pro shop. A permanent security detail requires a sentry at the front gate.

With an estimated net worth of $45 billion, he is now ranked 18th on the list of the world’s wealthiest people. Located on 3.2 acres of land in 2016, Zey’s modern extravagance is perched on a promontory at the end of a private cul-de-sac and has spectacular ocean and mountain views. The 11,000 square foot, five-bedroom, one-and-a-half bathroom mansion is reached through a lengthy, gated driveway that crosses a moat and has high ceilings, walls of glass, and seamless indoor/outdoor living.

According to the listing, a lengthy path leads past a reflecting pool to the wooden front entrance, which opens into an airy, open-concept layout with a theater with upper-level windows, a pond, and a “living tree.” The skyscraper, with its soaring eels and fountains, may be reached through a flight of stars.

The living room has a fireplace and opens into a modern kitchen with two high-end Korean appliances. The dining room is accessible through a pantry or kitchen, and it has a designer chandelier suspended from a wooden plank ceiling and an attractive rock accent wall.

The expansive master suite has a private terrace, a floor-to-ceiling window overlooking the city, two walk-in closets, a marble bathroom with a soaking tub and a separate glass-enclosed shower. There are three of the world’s best hotels with pools that are easily accessible from the city center.

There will be fruit trees and vegetable gardens strewn throughout the property, as well as a conversation pit, an outdoor kitchen with seating for a large group, a spa, a swimming pool, and a magnificent roof terrace.

Guests will not go hungry thanks to the hotel’s many amenities, which include a soundproof, state-of-the-art cinema outfitted with a 4K laser projector, a high-roller lounge complete with a Skee-Ball table and a bar, and an on-site fitness center and restaurant.

Plans for a roughly 5,600 square foot guest house with a bowling alley, four-car garage, and enough off-street parking for at least a dozen automobiles have been approved by the local planning commission.

Zed has many properties in the Los Angeles area. In 2014, he spent $3.9 million for a 3,443-square-foot, four-bedroom house in the Outpost Estates neighborhood of Hollywood.