I have already rented my first property and am excited to continue on to the next.

To answer both your questions, I would recommend you don't engage a real estate-focused accountant until you have at least one property.

A $1 MM property is not twice the work of a $500 K property.

I want my involvement in managing my future properties to lessen, becoming more "passive".

This basically releases the one moving out and the security deposit stays with the property. 

When starting out, I think you should at least be able to get to your property several times within the first couple of years to en reasonable amousure everything is set up and functioning properly.

Then there's the issue with doing a 1031 which is fine but my property taxes would go from $2200/yr to $4400/yr for an identical home. 

I've read a lot of people will buy a property as an STR, put it into service then do a cost seg.

If I were to purchase a property at the auction that is foreclosed for first mortgage but has code enforcement liens, will the code enforcement liens go away after I win the bid and pay off the mortgage or do the liens stay on property and I am responsible for them?

Hey Yi, If you invest in a multifamily property through a Roth IRA, you will not receive the same tax benefits as you would with personal cash, such as depreciation deductions.