351D: Two Black Girls Grow Apart at Summer Camp (Solved!)

Two black girls from NYC (I believe) have an opportunity to go to summer camp, maybe upstate? Catskills? Adirondacks?  One loves it, the other misses the city. They are best friends. Book describes city life well: hydrants on to cool the girls off, the cool of the apartment, waiting for mom to get home, making lunch, very detailed as I recall, which makes sense given how much I love richly described characters. Then off to camp where I believe the girls drift apart a bit.  I loved it and would love to know the title.

347P: Skateboarding Girls Try to Save Apartment Building

Preteen (maybe 13 y/o) girl lives in New York (most likely Greenwich village) with her single mother. They are about to lose their apartment or an apartment building is about to be torn down. She and her best friend, who is a POC, try and find a special artifact in the building before it is torn down or save the building from being torn down at all. I remember that a tree is growing in the foundation of the building. This girl and her mother sometimes ate egg sandwiches whenever they were upset. The girl and her best friend liked to skateboard.

333F: Greenwich Village jazz father and son (Solved!)

Growing up in a small town in Eastern Washington in the early 1970’s, I read a book I still remember. It’s a middle school targeted chapter book with a few line drawing illustrations. My copy was paperback. It features a father and son, the dad is a jazz musician / fan, I think they live in the Village - or at least someplace downtown NYC. Maybe there is some music that is played on the rooftop? Maybe parents are divorced? Published pre-1974.