FILE - In this July 19, 2006 file photo, a woman walks next to a "For Rent" sign at an apartment complex in Palo Alto, Calif. Real estate data firm Zillow reports on U.S. home rental prices in December 2014 on Friday, Jan. 23, 2015. (AP Photo/Paul Sakuma, File)

Monthly US rents keep climbing

U.S. home rental prices continued to climb at a modest pace in December, but rapidly escalating costs in cities such as San Francisco and De…