Just watched this in the theaters, and i immediately fell in love with the movie. Visually it's stunning, and it's probably one of the most gorgeous takes on the city of San Francisco i've ever seen in a film, with the director avoiding classic Hollywood San Francisco landmarks, and instead focusing on more local and mundane locations and teasing a breathtaking beauty out of them.
As a narrative, "The Last Black Man in San Francisco" is about home, and what it's like to love a place with all your heart (plotwise, a house, although in the greater metaphorical context of the film, the city of San Francisco) and to have to watch it slowly slip away from you.
It's about the false sense of entitlement we feel about the places we love - that belief that they're only "right" so long as they stay the way they were when we fell in love with them and "wrong" as soon as they start to change, conveniently forgetting that they were something different before we got there and made them our own.
And at the same time, it's about the tragedy of progress, and the fact that even though change is unavoidable, it's still sad to see all the beautiful, meaningful, weird, unique, beloved things that are lost as a result.
Ultimately the movie is an examination of the ongoing debate about our changing cities and spaces, and who that change is for, and what it's worth, and what it costs. It takes no sides and makes no judgements, and simply looks at the issue from a very human perspective of sadness and compassion.