Please Help Me Indendify My Trees

[treetoronto]

Hi There

Does anyone know what tree this is?

Picture Link:
http://imageshack.us/photo/my-images/7/photo1kdi.jpg/
http://imageshack.us/photo/my-images/152/photo2zn.jpg/
http://imageshack.us/photo/my-images/33/photo3yg.jpg/
http://imageshack.us/photo/my-images/715/photo4nn.jpg/

It is growing in Toronto Canada

Thanks

[Trees are neat!]

I think it is a Katsuratree (Cercidiphyllum japonicum)

http://dendro.cnre.vt.edu/dendrology...eet.cfm?ID=276

[Quirky Quercus]

I would agree with that. Katsura is one of my favorite exotics.

It's a shame those ones are multistem.

[treetoronto]

Thanks! Do you have any idea how tall these trees will get? What are the negatives to them being multi-stemed? Could I remove all stems but one? When I look at the link, I cant see these trees growing to look like that, they never formed any stems out of the trunks?