I need help identifying this bush that I have growing in my backyard. There used to be two large lilac bushes growing in that corner, one bush on each side of the fence, but growing together in one big bunch. When they built that house next door earlier this spring, they tore out the lilac bush that was growing on their side of the property line. Once they did this, we discovered a different bush that had been growing underneath the lilac bushes. A couple of weeks ago, it bloomed with thousands of pretty white flowers. Most of the flowers are gone now, but I managed to snag a couple of pictures. I have no idea what kind of bush this is.
The bush stands about 8 feet tall. The right side of the bush is what is left of the lilac bush. It bloomed pretty white lilacs about six weeks ago, but they died off already. These white flowers I'm talking about are most definitely not lilacs.
This is a close-up of the flower itself. Fully open, it's about the size of my palm. I have small hands though. It has little yellow thingies popping up in the middle.
This is one of the leaves. The leaves are a bit smaller than the flowers.
Any ideas?