All perfect praise be to Allah, The Lord of The Worlds, and may His peace and blessings be upon our Prophet Muhammad and upon all of his family and companions.
A Muslim is fully aware of the Prohibition of usury, for Allah, The Exalted said (What means):” Those who swallow usury cannot rise up save as he ariseth whom the devil hath prostrated by (his) touch. That is because they say: Trade is just like usury; whereas Allah permitteth trading and forbiddeth usury. He unto whom an admonition from his Lord cometh, and (he) refraineth (in obedience thereto), he shall keep (the profits of) that which is past, and his affair (henceforth) is with Allah. As for him who returneth (to usury) - Such are rightful owners of the Fire. They will abide therein.” [Al-Baqarah/275].
In addition, any kind of help with usury is prohibited, since Allah, The Exalted said (What means): ” but help ye one another unto righteousness and pious duty. Help not one another unto sin and transgression, “ [Al-Maidah/2]. Therefore, allocating part of the building for usurious bank’s ATM for rent is impermissible, since this suspicious act is considered a kind of help in usury.
In conclusion, there is no harm for you (Questioner) to lease out the aforementioned part to Islamic banks and institutions so long as they don’t involve any kind of usurious transactions. As well, we (Iftaa’ Dept.) advise both leaseholders and tenants to avoid suspicious transactions and seek for lawful ones since whoever abandoned unlawful matter for the sake of Allah, will be reward by Allah with something much better. And Allah knows best.