All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
There is no objection to working as an accountant for this company as long as its activities are lawful in Islam. The fact that one of its properties is leased to a usurious bank, though impermissible, does not affect the permissibility of your working in it as long as your job involves merely recording the company's revenue from its properties and maintaining the relevant records.
However, you should advise the company's officials to refrain from leasing the company's properties to usurious institutions and the like of entities whose activities are predominantly unlawful. If you are asked to conclude or renew a forbidden contract or the like, then you should abstain.
Allaah Knows best.