Thinking about how to incorporate modern design into an old townhouse? Wondering about installing skylights, ducts for HVAC or a giant window in place of the rear wall? At the City Modern Brooklyn Home Tour, put on by Dwell and New York magazines, you can see it up close and in person. You can also meet the architects and pepper them with questions about what is possible and how much it costs. A week of City Modern programming starts Oct. 1. For more information, tickets and photos of the properties, go here.