GK, we prefer that units are occupied too, but we have one vacant for 9 years and one for 16 years. Every year, our prop mgr sends a letter to the SHs to ask what their plans are for the units. One SH never replies. The other SH says she can't decide whether to sell or sublet and she'll do something soon but meanwhile she never does. We also have a few SHs who only live here part-time (usually half the year and the other half in a sunny clime) so their units are empty for months.

Our building is nice but not a luxury property. But we have 8-10 SHs out of 60 who pay their bills but don't seem to care if their unit is vacant all or part of the time. We put "non-use" in our sublet policy to include these empty units in our total count of units.