Tree ID

What is this beautiful tree?
I was told it's a chestnut and it needs a companion.

Those look like compound leaves, so it's not a chestnut. Might be a pecan.

From the visible features, I'd guess pecan or walnut.
More pictures would be helpful in getting a more definative answer.
I suggest...
Close up of the leaves-are the edges smooth or toothed(serrated)
Leaves, somewhat further away, to show the structure of the branches the leaves grow on
Close up of the tree bark
Close up of the developing fruit (nuts) or flower structure

If you are in the northern hemisphere, the nuts should be clearly visible at this time of year. Pecan and walnut blooms are also easily seen from the ground, though they look like dangly oddities, rather than flowers. In USDA zone 7 they bloom in March, I think. I have not yet seen chestnut blooms, so I cannot comment on them.

Here are the closeups.

It's easy to tell walnut trees because if you smash a leaf and smell it, it smells really citrus-y.

Todd Parr wrote:It's easy to tell walnut trees because if you smash a leaf and smell it, it smells really citrus-y.

I just crushed a leaf, it doesn't smell citrusy.

Laurent Voulzy wrote:

Todd Parr wrote:It's easy to tell walnut trees because if you smash a leaf and smell it, it smells really citrus-y.

I just crushed a leaf, it doesn't smell citrusy.

Not Walnut then  Pecan seems a good guess.  I don't know any tricks for being sure about that one though.

I dunno. I think your leaves are not toothy enough for chestnut. Keep watching it through the seasons. From the combination of flower and nut pictures, I think we can lock it down.

Walnut? http://ohioplants.org/walnut/
Butternut? http://www.carolinanature.com/trees/juci.html
Pecan? http://www.istockphoto.com/photos/pecan-trees-in-spring?excludenudity=true&sort=mostpopular&mediatype=photography&phrase=pecan%20trees%20in%20spring and http://ecogardenok.com/ecolandscaping/carya-illinoinensis-hardy-pecan-tree/
Chestnut? https://www.acf.org/ky/american-chestnuts-kentucky/identifying-chestnut-tree/