The number of luxury homes sold on Oahu declined by 20% in August, but the median price of those single-family homes and condominiums that sold for $1.5 million or more rose by 13% from the same month last year, according to a report from Coldwell Banker Pacific Properties. There were 44 homes and condos that sold last month for at least $1.5 million, compared to 55 in August 2018, the report said. The median price of those homes sold in August was $2.01 million, compared to $1.77 million during…