What type of tree is this?

Mystery solved! It is a Princess Tree

Update: With the help of others I was able to discovery this tree is called a Princess Tree. Click here to learn more about it.

As long as I have owned Blue Mountain Oasis, our rental cabin in Front Royal, I've had to combat a very aggressive and fast growing tree. Each year I probably take 5 of them down. They are very flexible, have giant leaves, and when bad storms come they sag and really cause a headache around the house.

For the life of me I don't know what kind of tree this is. Yesterday I took some down that were at the back of the property that I let grow for about 3 years. They were at least 50 feet high!

Help me identify this! I am curious. I've attached a few photos.

The most interesting part is the inside, which is hollow and runs from top to bottom and inside of all branches.

Have a peek and let me know what it is, if you know :)