See the above pictures for reference. Also for reference, the tree's location is in the southern Hudson Valley in New York state. There is a sycamore sapling growing through a crack in a sidewalk/concrete slab near my apartment door (the concrete is the city or the landlord's property, so definitely not something I can disrupt). The sapling is over a year old, maybe 2 years? I'm not sure. It is about 3 feet tall and at the base it is at most 1 inch in diameter. There is some type of large AC unit or something on the side of the building with a fence around it. This sapling has grown through a crack in the pavement between the AC unit and the fence. There are open spaces in the fencing so light still gets through. All the roots must be down below the pavement/concrete. I don't know how thick the slab is. There is one small root coming from the base of the sapling that is above the payment, but everything else must be below.
So that's the breakdown of the situation. My question is: Can I save this tree? I'm afraid if I were to try to uproot the tree, what would end up happening is the base of the tree would rip away from all its roots. I'd end up with the sapling from the trunk up with maybe one small root still attached, but the rest severed and below the concrete. Can I cut the tree at the base and try to treat it as a cutting? Although I am very experienced in household container plants, I have zero experience in regards to trees at all, let alone a situation like this! But I'd love to hear if it is possible to save this tree!
Thank you in advance for your time and expertise, I am sincerely grateful for any and all suggestions!
EDIT: There is an open sunny area near a decent sized creek not too far from me. I've been given the OK to plant the tree there, assuming its possible! There are no houses or structures directly near the area (its a park) so the tree would have plenty of room to grow, be healthy, and not cause any damage or be a nuisance! So the question is asked because I know the building owner will want to be rid of the tree soon and I'm just hoping maybe it can be saved instead of just killed because I've grown quite attached to the lil' guy! Thanks again for all the advice and suggestions!