Thanks for the response, Mindy, and I would actually take it a step further - Instead of saying that it is "reasonable" to leave when buying a new home, I look at it in one of two ways:
1) In the future, I really think apartment communities are going to find their "identity" - what makes them a compelling option, so that their isn't a standard apartment -> home ownership track. Although it's not here now, I would constantly push my community to understand what experience we can provide that will make it better than single family homeownership.
2) For the present, I think my strategy would not be to win the "battle" against homeownership, but rather simply delay that person for one year. I mentioned this a couple of years ago, but if we
delayed homeownership for one year
per renter across the board, every single community in the country would see an occupancy jump of 10%! (Actually, our entire industry may not even be able to handle that bump)
I would say there are strategies for just about every single supposedly impossible situation, aside from illness/death. For example, talking about job transfers/new jobs... If this is a big issue for the community, then I would say that targeting companies and industries that have lower job turnover would be brilliant, or possibly requiring that the renter have lived at their prior residence for at least X years to show they are less transient in nature.
I think there is a strategy for just about everything!