App or software for analyzing and bookkeeping?

[Erin Babnik]

Can someone recommend a VERY simple app or software program for analysis and bookkeeping? Specifically, we have a commercial property in California that recently had a massive increase in the fire insurance premium. After years of sort of cruising on auto-pilot with a single tenant on a long-term lease, we figure it's time to assess the real value of this longtime family investment in case it might be time to sell. Is there an app for that?