Suggestion: reach out to anyone marketing a unit for rent on the web, sign or newspaper.  

Both of these providers have the ability to store docs and other info about your property.But if you're looking to simply track links to your mortgage servicer, utility providers, etc. a simple Google sheet should do the job.

Even just a box store H&R Block type of professional if you don’t already use one to help maximize your deductions and write-offs from the real estate.

They have helped my parents retire comfortably, paid my kids way through college and been a great way to store and build wealth.

@Lucas MoralesIf you have coin op laundry in the building as well make sure you have a machine that gives quarters as I have had people use the vending machine to get their quarters for laundry and you have to constantly restock it.Personally I would say it’s not worth it unless you are far from grocery / convenience store.

As for vTiger, I believe it’s free version is self-hosted, which means you need to have your own web hosting infrastructure and domain setup to take advantage of their open source option

If you are up in the mountains, somewhere to store snowboards.

You could be buying a small manufacturer, or a retail store.  

It's not a line, it's a confusing (even for tax professionals) web of connected and contradicting rules.

I can even do it with grocery store carts.