The most expensive cities include San Jose, Calif., at a price-to-income ratio of 9.6, Los Angeles at 8.83, San Francisco at 8.79, Honolulu at 8.07 and San Diego at 7.3.

The price-to-income ratio in the West, the least affordable region, jumped to 4.9 from 2.1 in 1960. And while median home prices rose by 195%, median household income only increased by 26 percent, which means the growth rate of home prices is 7.5 times more than the growth rate of household income, the report said.

San Francisco, Los Angeles, Seattle and Denver all had a price-to-income ratio below 2.6 in the 1960s. But from the 1980s on, the ratio for San Francisco and Los Angeles climbed to 4.7 and 5.6, respectively, reaching its peak before the 2008 financial crisis at 9.2 and 8.8.

In Los Angeles, the growth rate of median household income since 1960 has been slower than the national average, the report noted, yet the growth rate of median home prices more than quadrupled, with a growth of 358%.

San Francisco is one of the few metro areas that almost doubled its median household income since 1960 with a growth rate of 91%. The city’s boom has led to an increase in high-demand, high-paying jobs. However, home prices increased 531% since 1960, reserving homeownership for the hyper-rich, despite the financial growth of the metro, the report said.

For example, the median home price in 1960 adjusted for 2017 inflation was $134,713, whereas in 2017, the median home price was $849,500.

With its growth rate of home prices 4.2 times more than the growth rate of household income, the Northeast is the second least affordable region, the report said.

In the 1960s, owning a house was affordable with a price-to-income ratio of 2.1. But that rose to 3.7 by 1990 when home values started to outscale household income in the 1980s. The price-to-income ratio reached its peak around the 2008 financial crisis at 4.6 and dropped to 4.0 in 2017, the report said.

The decrease over the few years, however, does not seem to fit the trend in all coastal metros. In Boston, home prices increased by 24% between 2010 and 2017, after dropping by 25% during the financial crisis, and median home prices increased 228% since 1960.

The South has some of the nation's most affordable housing, according to the report. Compared to the West and Northeast regions, the gap between home prices and household income is not as wide. The price-to-income ratios were around 2.6 between 1960 and 2000, but prices jumped during the 2000s and kept diong so through the housing crisis.