PRICES for both homes and commercial real estate are falling again. Meaningful improvement may have to wait until there are many fewer distressed properties for sale.

Indexes of the two markets showed this week that the latest declines had almost wiped out the mild gains the two markets had shown after prices appeared to have hit bottom.

The Standard & Poor’s/Case-Shiller index of home prices ended February 3.3 percent below where it was a year earlier, and just 0.5 percent above the low reached in May 2009. The Moody’s/REAL Commercial Property Price Index was reported to be down 4.9 percent over the last 12 months, but still 0.8 percent above its low, reached last August.

In both cases, sales volumes are far below what they were when the markets were booming, and a large proportion of the properties that are being sold were in trouble before the sale. The National Association of Realtors estimates that about 40 percent of existing homes that changed hands in March were either in foreclosure or were so-called short sales in which the house was sold for less than was owed on the existing mortgage.