The home owners association of my community is planning a major special assessment for roof replacement. In the past 5 years, a number of the units had their roofs replaced at the cost of the owners or former owners, not the association. Most of these roof replacements were obligated by either home insurance requirements and/or conditional to sale transactions. In a recent meeting on the subject, the board of directors verbally suggested that owners of these units can be exempt from the special assessment. Is this legal since there are no rules in the association's bylaws that would address such exemptions?