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Most expensive house (we could get into): Ave. of the Arts, Philadelphia

Have you ever wanted to sleep in the clouds? Well, you can in this two-story penthouse in Philadelphia's Avenue of the Arts neighborhood.

Towering above the city on the 30th floor, all four bedrooms in this penthouse offer panoramic views of the city below.

Still not impressed? A few steps will lead you outside to a private terrace where you can sip on a few drinks while sunbathing in the "City of Brotherly Love."

This 4,569-square-foot apartment includes a sleek, modern kitchen, spacious closets, a family room and even a grand piano.

The building's amenities include the use of a pool and jacuzzi, a fitness center and a wine cellar.

I'll drink to that! And you can too, if you have $5 million.

To see the full listing, click here.

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—By CNBC's Valerie Patriarca and Heather Schnepf


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