Exterior, House Building Type, Flat RoofLine, and Wood Siding Material In realizing their dream to build a country retreat in upstate New York, Sandy Chilewich and Joe Sultan—proprietors of the textiles firm Chilewich|Sultan—eschewed a mountainous view for an understated wooded plot. At 800 square feet, the flat-roofed home is a modest structure for the expansive 10-acre property.  Best of #ModernMonday: Design and Education by Zachary Edelson from An Architect's Tips for Keeping Your Electric Bills Down