Method/Software For Tenant Management
We have a total of 5 buildings. 4 are commercial and 1 is residential apartments. Together there are around 50 tenants. 

We're pretty old school in how we sign and manage tenants. We use AIR CRE for our contracts with  tenants. Once they sign and move in, we build out a physical folder for them. Which includes; tenant contracts, notices, late fee invoices, and business insurance. Anytime there needs maintenance work on them, our vendor bills us and we put it in our QuickBooks including a note for which unit had the work done for. At the end of the month we look at our QuickBooks and add into an excel sheet for which tenant had what work/vendor. 

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I want to "modernize" our approach to this system. What do you recommend?

My perfect scenario would be a **Tenant Management System** which digitally builds a file on our tenant. This includes giving me a heads up when their lease renewal is up, if I'm missing business insurance from them, tracks all our work done to their unit, etc... Most of the management systems available are for much larger corporations with over 100+ tenants. Any advice?
[{"id": "fai26t3", "text": "I manage a lot of residential but also commercial as well. I use Buildium and it works for both sides. Banking, billing, work orders, you can track and save 1099s for vendors, upload all your documents, track leases etc. \n\nIt's not made specifically for commercial, but found it ok for my needs.", "replies": [], "depth": 1}, {"id": "fakb8vv", "text": "I've had a good experience working with appfolio.", "replies": [], "depth": 1}, {"id": "fc8l91d", "text": "I can help you. I have software that will create a \u201cpage\u201d for each of your tenants with any related data you want to keep on them. Google my username to check it out and message me if you\u2019re interested and I can help you get started or answer any questions you have.", "replies": [], "depth": 1}]