BUSINESS MEMO: MOST EXPENSIVE HOMES

San Francisco has displaced New York City as the nation's most expensive city for single-family homes, while Oklahoma City remains the most affordable, a survey found.

The survey, released last week by Ernst & Young's Kenneth Leventhal Real Estate Group, compared the cost of buying a four-bedroom home or renting a two-bedroom luxury apartment to median take-home family income in 75 areas.

On average, San Francisco home buyers spend 39.7 percent of their income on housing, while buyers in Oklahoma City pay 16 percent, the accounting firm's survey found.

New Yorkers pay an average of 38.3 percent for housing, while Los Angeles residents pay 36.8 percent, the third most expensive.

Following Los Angeles were Honolulu (33.1 percent); Miami and Boston (both 32.1 percent); Oakland-East Bay, Calif., (31.5 percent); El Paso, Texas, (31.1 percent); Pittsburgh (30.8 percent); San Jose, Calif., (29.9 percent).