From the visible features, I'd guess pecan or walnut.
More pictures would be helpful in getting a more definative answer.
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.