Everything we know about the mysterious $1.5 million apartment Melania Trump owns in Trump Tower

Located on Fifth Avenue in Midtown Manhattan, Trump Tower's 68 floors contain 263 apartments.

Source: Trump International Realty

The 26th floor housed the president's office for the Trump Organization. He reportedly had a private elevator that could whisk him from his office to his penthouse.

Source: Town & Country

The bottom floors feature space for offices, dining, and retail, while condominiums fill floors 30 to 68.

Source: Trump International Realty

Notable celebrities who have lived in the building include Bruce Willis, Michael Jackson, Johnny Carson, and Paul Anka.

Cliff Schiappa/AP

Source: Town & Country

The sixth floor of Trump Tower has been the home of the Trump campaign and where NBC's "The Apprentice" was filmed.

Source: Town & Country

The Trump family's penthouse takes up the top three floors. It's one of several units the president has owned in his namesake high-rise building over the years.

Source: Town & Country

Melania Trump owns apartment H on the 33rd floor. There aren't any photos of that unit available online, but these photos from StreetEasy show apartment 32H, which looks to have the same layout.

Sources: StreetEasy, Office of Government Ethics

We reviewed several H floor plans on different floors of Trump Tower, and they all seem to follow this setup.

Source: StreetEasy

Her apartment is 1,052 square feet and located on the southeast corner of the building, overlooking Fifth Avenue and East 56th Street.

Sources: Douglas Elliman Real Estate, The Real Deal

It has one bedroom, also with sweeping views. Trump's disclosure form lists "721 33H LLC," the apartment's address and a pass-through company for the property, saying the real estate is valued between $1,000,001 and $5 million.

Source: The Real Deal

It also has a sizable walk-in closet, though the one in the penthouse upstairs looks much larger.

Sources: The Real Deal, Getty

In January 2016, Melania bought the unit for $1.49 million, apparently from the building's condo board. It appears to be the only one the board has ever bought, The Real Deal reported, citing property records.

Sources: The New York Post, The Real Deal

This type of unit (a studio or one-bedroom in a luxury skyscraper) is usually used for staff members of residents who have much larger apartments in the building, or for a live-in superintendent. The condo board first bought unit 33H for $650,000 in 1997.

Source: The Real Deal

While it's unclear why the first lady bought this apartment, some speculate it was for use as a library.

Source: The Real Deal

Or maybe it's just a private space for her to get away from it all and relax. Since she has never mentioned the apartment, it's a mystery.