They are learning bout limits, deductions, liability, etc.They meet with my attorney for my will and Trust, and know how they are set up and who will eventually manage what.They know that business is business and charity is charity, and are learning how to apply that. 

I don’t think any landlord who is trying to make a profit does You know what a real landlord would do...Cite the lease, fix the problem, and if you they don't pay deduct it from their security deposit.I don't think any landlord trying to make a profit wastes their time getting in texting battles with tenants over chipped paint, pal.

There is even a school of thought to use market rents then deduct 10% vacancy, then 50% expenses and that should give you NOI (rule of thumb).

The principal portion of your mtg payment is not deductible.  

Is the cost of the windows tax deductible?

@Levi Klein great work!

While you certainly can (subject to the contribution limits), your ability to make deductible contributions to an IRA is limited if your AGI is too high.

This also now comes into play with the QBI deduction since there's a limitation related to qualifying assets  well. 

@Levi KleinCongrats Levi!

It it were not, then it would be called a fee of some sort.In addition in CA, after a tenant vacates a rental, the landlord is required to send an itemized statement within 21 days detailing what expenses, if any, were deducted from your security deposit as well as the balance of the security deposit.