Here's some online software options that you commonly see recommended on BiggerPockets.

This is a straightforward and common approach.However, make sure to document the change in the lease renewal or addendum, specifying the new security deposit amount.

I have heard that it is common practice that private money lenders collect a monthly fee thru various methods, I'm trying to determine what those methods are.   

There are a couple of others less commonly used. 

Hello, we have a. apartment complex in LA County and want to install security cameras in the common areas.

while I totally understand the frustration especially purchasing what was supposed to be a new and ready to go asset, but these things are pretty common so don't feel to discouraged. 

If you are new to the business the most common issue is you're either locking up deals too high or you aren't finding attractive deals.

On the other hand, you might find a common reason that a few of your potential investors are not investing that might change your own thoughts on the deal.

Another example is that with a tax auction it is common for all the interested parties to not be notified 100% correctly meaning they could in theory come back later and try to reverse the sale and take the property back!

While it might feel like an extra charge to tenants, these packages often provide value that indirectly benefits the property owner as well—like reduced maintenance calls or ensuring the property is better protected.In my experience managing a large portfolio of properties, these fees are becoming more common due to the thin margins in property management.