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Upper Northwest D.C. has its share of $4 million houses. Rarer are $4 million houses that don’t yet exist.

Enter 2939 49th St. NW. For $3,995,000, the lucky buyer gets a McMansionesque exterior and a customizable interior. Want six bedrooms or eight? A living room with a fireplace or without? It’s up to you.

The house, with a listed “built” date of 2014, is billed as “exceptionally private,” though for a home on more than 19,000 square feet of land, it’s jammed up pretty close to its immediate neighbor, which also may not yet exist.

Take a look at the renderings:

More details at Estately.