A study by Mortgage company Lending Tree examined 2017 mortgages for owner-occupied and non-owner-occupied properties to determine the effect on housing stock. The study found 13.4 percent of New Orleans mortgage loans last year were for homes the owner didn't occupy, compared to 15.4 percent in Oklahoma City, which ranked No. 1, and 5.2 percent in Detroit, which ranked No. 50. The homeownership rate in the top 10 cities averaged 59 percent.