Soaring mortgage rates and high sales prices are putting homeownership out of reach for an increasing number of Americans. In the nation's eight least affordable housing markets — seven Californian cities along with Seattle — prospective buyers must now make at least $200,000 a year to afford a typical monthly payment for a 30-year mortgage, according to a Redfin study. In some of those cities, they need to earn a whole lot more. An annual income of nearly $403,000 is required to buy a median-price home in San Francisco; in Seattle, it's $205,000.