For investment...create LLC, quick claim the property to LLC, create the LLC as you as member and designated agent, amend the article of organization to transfer your father rights to the Trust should he pass away.

I am changing the payment frequency and due dates for a tenant at their request and I am trying to determine if I should use a lease amendment or a new lease.

Can I just produce an amendment and have all of the parties sign the amendment that essentially states the old tenant is moving out and the new tenant is taking her place on the original lease?

This is because they are going to spend significant time prior to the meeting to analyze your return, look for errors (and opportunities to amend) and make sure you don't have any red flags that they can't/don't want to involve themselves in and/or also check for areas of tax law in your situation that they are not familiar with and don't feel competent to address (not every tax pro is an expert in every issue)I don't charge for my initial consultation, but I also am not going to offer to review your return and offer specific strategy. 

If you amend lease, it goes on top of original lease. 

A clause like this keeps the tenant from avoiding late fees and other charges simply by paying the current rent.If unspecified, I would specify it in an amendment to the lease and either ask the tenant's preference or default to whatever is most favorable to the tenant.

Often times, the first thing I do when I'm reviewing a self prepared tax return (or even a professional one), is determine if we need to amend the prior year's due to errors. 

Take another look at the plan (or amended plan if there is one) to see the scheduled end date. 

Source: https://www.sec.gov/corpfin/amendments-accredited-investor-definition-secgWhat am I missing?

For us, even though it is a pain, we keep it free except for the application fee so that we don't deter them from letting us know they have moved someone else in (or out) of our property.I'd amend the toilet fee to include blocked sink drains.