Two new reports released Tuesday show home prices continuing their skyward vault, with supply shortages and strong demand putting upwards pressure on prices. U.S. single-family home prices in 20 key urban markets rose 19.1 percent in June from a year earlier, marking the largest annual price increase in the 20-year history of the 20-city composite measure, according to the S&P CoreLogic Case-Shiller home price index (pdf), released on Aug. 31. “June 2021 is the third consecutive month in which the growth rate of housing prices set a record,” Craig Lazzara, Managing Director and Global Head of Index Investment Strategy at S&P DJI, said in a statement. “The last several months have been extraordinary not only in the level of price gains, but in the consistency of gains across the country.” The 20-city index shows home prices are now 29.9 percent higher than the 2006 peak. At the same time, the Case-Schiller national …