BEVERLY HILLS, Calif.—Donald Trump will soon be Ed McMahon's landlord. Trump announced Thursday he would save the television personality's Beverly Hills mansion from foreclosure by buying it for an undisclosed amount and leasing it to McMahon. The developer told the Los Angeles Times he doesn't know McMahon personally, but acted out of compassion because helping out "would be an honor." McMahon, 85, who was Johnny Carson's sidekick on the "Tonight" show for three decades, has not worked for about 18 months because of a neck injury. He defaulted on $4.8 million in mortgage loans with Countrywide Financial Corp.