As the owner of free-and-clear investment RE I could care less about the market value - in fact, I'd rather it fall by 50% which would save me a bundle on taxes. What matters is stable rents and the availability of quality long-term tenants. If you own low- to mid-range properties in local markets based on the "eds and meds" economy rather than boom-bust industries, or exurban housing tracts etc., then this problem takes care of itself.