Keeping the reserve fund healthy is a perennial challenge for most co-op and condo boards. Many rely on a flip tax, also known as a transfer fee, which funnels a percentage of each apartment sale into the reserve fund. It works splendidly when the real estate market is active and apartment prices are high. But with co-op and condo sales slowing to a crawl and with New York City’s real-estate market poised for a “year of disappointment,” according to the appraiser Jonathan Miller, relying on a flip tax suddenly looks like a shaky proposition.   Read the article………………………..