Got a spare $18.995 million to spend? Consider a six-story (plus finished cellar) townhouse at 25 West 88th Street, just off Central Park. The six-bedroom home has "several activity rooms designed for yoga, meditation, exercise and crafts." If you have the money to spend on this home, energy costs probably aren’t a big worry, but the home is LEED Platinum-certified and passive. It has solar panels, a backup generator, a koi pond, a rainwater collection system, and ethanol fireplaces. If the sumptuous surroundings of the interior and garden aren’t enough, step out on to the deck, where you’ll find one of the fireplaces.
• 25 West 88th Street [StreetEasy]