Crain’s residential real estate reporter Dennis Rodkin and host Amy Guth discuss the latest news from the local market, including record-breaking sales in Chicago's higher housing tier and Cook County’s push for affordable modular homes.Plus: Office demand freefall resumes as downtown vacancy reaches a new record high, Rivian's micro-EV spinoff valued at $1 billion, Blue Cross parent renames Medicare offerings following Cigna deal and CME debates the meaning of "trading floor" as $2 billion trial gets underway.