National home value growth ground to a near standstill in April, with moderate gains in the Midwest and Northeast offsetting declines in many Sun Belt and Western metros, reflecting the ongoing fragmentation of the US housing market. At the national level, the value of single-family homes as measured by repeat transactions rose 0.8% in April compared to a year ago, up from a 0.7% increase the month prior, according to data from the  S&P Cotality Case-Shiller Index  released Tuesday. “With