This stunning rooftop oasis in Manhattan’s Flatiron District is anything but flat with its swimming pool, outdoor shower, built-in kitchen and planters, and cobalt blue accent planters. All of this can be yours, too, since this spacious penthouse apartment is currently on the market for $18 million. The plantings include accents of gold, which pair strikingly with the bright blue ceramic pots. We chose a combination of structured looking plantings like Steed hollies, arborvitaes, boxwoods, and ‘Gold Sword’ yuccas, all of which create a high contrast look against the looser and more informal look of plantings like blue and white violas, gold mop cypresses, and weeping ‘Blue Atlas’ cedars. All of the planters contain low-voltage landscape lighting and drip irrigation.