Bob, I'm just not sure. I would recommend that you check our data base for tomato leaf diseases, or google tomato leaf diseases just to be sure. Usually leaf diseases have black, grey or yellow spots. It may be a light issue. I'm thinking the plants would benefit from being on your balcony on sunny days. Yes, a lot of folks are gardening during these pandemic days. Other than those weird spots, they look good overall.
You've definitely got the touch at growing from seed! I've heard of folks growing tomatoes from the seed of the tomatoes they grow.