What do you do when you want the space and amenities of a luxury home but you don’t necessarily want a large property to maintain? Look up. This penthouse unit at the Vendome on Turtle Creek offers the square footage and privacy of a large home, but it’s set high in the sky. The condo has 6,638 square feet of space with an elevator that opens directly into the unit’s foyer. Listing agent Kyle Crews of Allie Beth Allman & Associates said the size and finish-out of this unit make it feel like a custom home in the sky. “It’s ideal for someone that has decided they want high-rise living…