Especially when there are other software's out there that perform these tasks in addition to all the other features investors liked about Buildium.

I have done it with some contractors taking Paypal where you can use a credit card on that site with a fee, or QuickBooks is another one too.

There a number of good references on this site.

All have performed well and rent easily.

I found what seemed to be a great property with a house for an STR and other space that I could expand for camping/RV sites and a barn that could be converted into a venue for events. 

(https://www.mynd.co)One of my co-workers at my last job (pre-covid times) used to work\invest with them, so I had probably registered on their site back then.

To set the scene: A cost seg study breaks your property into two important categories:1250 "real" property aka the building, foundation and other long life assets.1245 property aka anything that can be accelerated such as 5, 7, or 15 year property like carpets, cabinets, or other site improvements.

My client bought a 22 unit building and used this strategy and walked out of closing with a check for $800k to perform the rest of the renovations, paid himself back his already expended rehab costs and his entire down payment.  

It's less expensive and improves upon the properties performance.  

Evaluating deals on this site will help you understand expenses, income, and financial statement.