For months rumors have swirled that developer Madison Square Garden Co. (MSG) would buy the midcentury modern LA Forum arena in Inglewood, former home of the LA Lakers and LA Kings. (Its architect, Charles Luckman, also designed Madison Square Garden.)  That deal is now official, according to Crain’s New York, who said the company just paid $23 million for the property. MSG will begin a “comprehensive renovation” of the arena later this year, and details of that job will be released this fall. The company is currently working on an $850 million renovation of Madison Square Garden, itself a taxing job that is set to be done by next year.