Okay, so we've all, at one time or another, been to the Mansion off Rittenhouse Square. And whether we'd like to admit it or not, despite the crazy crowd and questionable weekend chaos, we thought the space was kind of cool (you know, in that creepy way).

Luckily for us, the centuries-old building at 121 S. 19th St. is under new ownership and ready to be seen in a whole new light. O.N.E., the new members-only social club, is keeping the grand-estate details (I mean, who can imagine that place without those looming railing gargoyles?) while adding modern touches to give the whole space a more Miami-nightclub feel (talks of hot-pink accent walls are in the works).

The original fireplaces will juxtapose with urban murals (left), a first-floor martini bar, leather couches, glow-in-the-dark walls, bottle service and a Playstation room complete with recessed trim lighting. O.N.E. will be an after-hours spot, and its members will get additional perks like discounts at local gyms. Also not confirmed but on the drawing board are themed nights such as an oldies night and a retro night.

You can expect to see us here when O.N.E. officially opens its doors to the masses. For now, we will all have to settle with these Sneak Peak photos and wait until the grand opening for the big reveal.