With Florida’s real estate market “definitely tightening,” as one economist put it, home sales in the Tampa Bay area showed decidedly mixed results in November. In Pinellas and Hillsborough counties, year-over-year sales of single-family homes were essentially flat, although sales of condos and townhomes jumped substantially — 13 percent in Hills­borough and 16.6 percent in Pinellas. Pasco and Hernando counties…