Rent/Expense Increase Percentages

[Cole Welch]

When using the BP calculators, how do you decide on your Annual Income Growth % (rent) and Annual Expense Growth % inputs?  Do you set them as the same % or different?  I'm skeptical of steady rental increases for 30 years.  For example, a 2/1 apartment in a small multifamily may rent for $750 in 2018.  At a 3%/yr increase, that will go to about $1,800 by 2048.  Is that a realistic expectation on future rents?  I'm using 3% based on inflation percentage which is usually between 2-4% I believe.  My assumption is that you would need your rental income to at least keep pace with the inflation as this will likely drive your expense percentage increase.  Thank you in advance for any insights provided!