This commentary is by Alden Wicker, a homeowner, journalist and author who lives in Windham. In 2014, I bought an income-restricted co-op in Brooklyn for $250,000. The market price for that apartment would have been around $650,000, but it was under New York City’s Housing Development Fund Corporation, a low-income housing cooperative with rules to prevent these units from becoming investments instead of homes. If your income is below the neighb…