I can't be 100% sure without a close up of the leaves, etc. but it's probably a commercial ornamental/genetically sterile cultivar of callery pear like Bradford Pear. They are bred not to fruit, but can occasionally fruit, and birds and animals can scatter the subsequent genetically fertile offspring around. This has become an invasive species issue in some states.
There has been recent improvements in these cultivars, but trees that were planted in the 80's were discovered to become weak with tendency to drop heavy branches and split down one side of the trunk in extremely windy or icy weather after 20-25 yrs.
Unfortunately, the developer for my neighborhood planted them everywhere. My neighbor has original landscape trees as well as some offspring trees on their property that they have kept only by yearly professional maintenance to completely trim/pollard the trees. Three other neighbors have had their mature trees cut down after each have lost massive branches and/or lost one side of the tree due to split down trunk. (In one instance the fallen branches fell across her driveway but luckily she had her car in the garage. In another, the fallen side of the tree was leaning on the house
) Another (probably luckily) lost theirs to serious fireblight infection -- I was so relieved when they finally got their tree chopped down because that tree used to drop infected dead leaves that would blow into my little apple and pear espalier fence row, and even my fireblight resistant cultivar trees would get one of two small branch tip infections under the massive exposure.