How to do due diligence on an Office Tenant?

[Matt Liu]

I am looking seriously at a single tenant office building. The only problem is that the area is not very good, so ALL bets are on this one tenant (a non-profit that "helps provide services to more than 10000 people with special needs, their families, and seniors"). They do have a five year lease. But how can I verify that they are financially stable for the long-term? How can I investigate to see if their plans are to renew the lease? Should I call the director or the manager to see if I can interview them?