Trying to identify a tree
I have this really beautiful tree in my garden that came with the house, but I'm having trouble identifying it. It produced clusters of little red leaves early in the season, as well as small flower bud clusters that resembled cauliflower florets (my mom affectionately calls it her "buttered cauliflower tree" lol). As the flowers got bigger, they opened to look like yellow astilbe plumes, and now the leaves look similar to rowan, only more rigid. My neighbour thought it was filipendula, but I don't think it is; the flowers are different in shape and colour, and the growth habit seems different. I would really appreciate it if anyone could help me identify it.
The picture isn't great (my camera is terrible), but it's the "flowers" as they opened.