The tax basis and depreciation basis for the original rental unit is unchanged. 

We have it in our lease that it "will renew for the same period of time if unchanged by either party"Also, does that have to be sent via certified mail?

Markets are changing a bit but our high concentration rental areas are still mostly unchanged.

We The People declare all laws set forth in the 1874 Pennsylvania Constitution (as ratified without subsequent amendments), the supreme law of the land and will forever remain unchanged and uncompromised.

or would that be unchanged??

Beating index funds takes effort, which is why BiggerPockets exists for those interested in real estate investing.Interestingly, the government's asset-based definition of an accredited investor ("millionaire") has remained essentially unchanged since the 1930s (Dodd-Frank required the value of one's personal residence to be eliminated from the equation when calculating net worth).

Traditional banks/credit unions have remained largely unchanged.

When U[t] = interest at t, P[t] remains unchanged and you are in the so called Perpetual Amortization situation UNLESS a finite term is contractually given.

The average sales prices were nearly unchanged. 

These views are virtually unchanged since April 2021."