Last week on Forbes.com I offered you my list of frivolous things that luxury real estate buyers waste too much money and attention on. Zen parks, electronics systems, outdoor showers—it’s not surprising that buyers shopping for high-end homes in big cities find these amenities tantalizing.While sex sells, so does quality. And although a seductive marketing campaign can generate premiums unknown, there are certain attributes that a luxury property can’t be without. You already know the adage: location, location, location. But besides location, there are other things that high-end buyers would be wise to spend more energy, money and time on.