This The Big Bang Theory screencap contains
living room, living room, sitting room, front room, parlor, parlour, family room, and den.
There might also be
brasserie and dinner table.
Sheldon mentioning Penny in the series finale of "Young Sheldon" doesn't automatically imply Leonard's demise in The Big Bang Theory. Speculations about Leonard's death arose from a casual remark, but there are numerous plausible explanations.