The unfinished 'shells' of two half-floor, two-story San Francisco penthouses are selling for $7.5 million and $10 million after they failed to sell as a joint $49 million condo

Penthouse 41A in a high-rise tower near San Francisco's Financial District is for sale for $10 million.

It takes up parts of the 41st and 42nd stories in the tower at 201 Folsom St.

It is one of the two "shells" that were originally going to be conjoined as a sweeping $49 million penthouse.

But since that didn't pan out, it was split into two separate units.

The "shell" of the condo is unfinished.

However, it's currently staged with pop-up walls and furniture to give buyers an inkling of how it could look.

Penthouse 41A is wrapped by a 250-foot glass facade. You get complete 360-degree views of the city and the bay.

The unit comes with 18-foot ceilings. Shannon said it's currently the only condo in the city with ceilings that high.

The penthouse comes with three bedrooms and three-and-a-half bathrooms.

There are also three outdoor decks.

The Salesforce Tower is in clear view from one of them.

The 41A unit, and also its sister unit, comes with parking space for up to three vehicles in an underground valet garage, Shannon said.

The tower also has community amenities available to all tenants, like a pool ...

... a movie theatre ...

... a rooftop terrace ...

... a fitness center with a climbing wall ...

... and a two-story club lounge.

The 41A unit is one of the last remaining units available in Lumina's Folsom Street Tower.