As of July 15, RealtyTrac listed 28,829 properties which had been foreclosed and repossessed by lenders. Some have been owned by the bank as long as 2½ years without having been placed on the market. Roughly half have been repossessed by the lender since late January 2010.

This year, banks in the Chicago area have foreclosed on a huge number of expensive homes. RealtyTrac lists 2,650 repossessed homes for more than $300,000 and 169 for more than $1 million.

Here is where it gets really interesting. Out of 28,829 repossessed properties, there were only 1,292 listed by lenders as "for sale." The vast majority of these available homes were inexpensive. A mere 29 homes over $300,000 were for sale. In other words, the banks have withheld from the market 2,621 properties listed at $300,000 or higher.

There are probably two important reasons why banks have pursued this strategy. First, they are concerned that placing these more expensive homes on the market will severely weaken an already thin upper tier market.

Even more crucial is that selling substantial numbers of expensive homes at discounts of 50% or more would compel the lenders to take substantial losses which have been avoided by keeping them off the market.