The guys from Mad River (Old City and Manayunk) are penciling in late February for their next project, in a historic firehouse at 1528 Sansom St.

The multilevel hot spot will be called Ladder 15 -- just to remind people of the cross street. If you want historic accuracy, you'd want to know that the building used to be home to Engine Co. #4. (It closed in 1984.)

Ladder 15 is being positioned as "upscale yet unpretentious" with 35-foot ceilings, stone walls, industrial-looking steel railings and two fireplaces. Menu will be designed by Mike Stollenwerk of Little Fish.

This deal has been in the works for more than a year.