Are there any benefits I may not be aware of here? 

Also, the benefits of a cost segregation study can vary based on a multitude of factors.

Also look at pricing softwares and adjust accordingly.

There are a number of tax strategies which you could benefit from.

Newton's law of tax: What goes down must come up.Everyone enjoys the sweet benefits of bonus depreciation, but what happens when you sell?

Your property definitely has the potential to benefit from a cost segregation study.

I mainly want to ask if these assumptions are reasonable and if there's anything I haven't considered:(1) multifamily units in NJ close to New York City, ~$1,000,000, 20% down payment, (2) Using the following assumptions: 4% appreciation rate, 6.5% interest rate and 5.0% refinance after 5 years, $10,000 yearly maintenance fee(3) ~$6,000 monthly rental and assume 3% increase yearly with 5% vacancy rate(4) Based on the above, the calculated IRR if selling at the 10th year is ~19% (considering tax benefits) and ~17% (without tax benefits).

It just adds complexities and costs without any benefits. 

The IRS disaster assistance page and hotline are key resources for those seeking guidance.One significant benefit for those who have experienced property damage is the potential to claim a casualty loss deduction.

Income taxes- if needed can you use your 2 year primary residence deduction if a taxable event occurs.13.  1031-  if any part of the insurance claim is a taxable event is there some way to do a 1031 with lenient time frame adjustments?