I came across a 2-flat with a basement that has been converted into garden unit with 3 bedrooms and kitchen and bath.

This could be a flat fee or a percentage of their assignment fee.

Flat Fee buyer agency to reduce acquisition costs (get ~2% of the sales price back), and flat fee MLS listing to reduce selling costs to ~$500.

I will just have my bookkeeper bill a flat amount monthly from Jan 1st on. 

However, if the property is a long-term hold, the lower interest rate with a prepayment penalty can often result in better overall returns.Another consideration investors should evaluate is how prepayment penalties are structured - whether it's a declining penalty over time or a flat fee - because this can significantly impact their profitability when selling earlier than expected.

I came across a 2-flat with a basement that has been converted into garden unit with 3 bedrooms and kitchen and bath.

wow never seen flat roof designs in that part of the country. 

I do have a nightly pet fee but i put in my listing that if someone is bringing a pet for an extended period of time they can also reach out to me to discuss a flat pet rate for their stay.

I just don't have the time or desire to comb through their coursework, and I'm sceptical about the "mentoring" aspect - would happily just pay someone who's got incredibly profitable Airbnbs a flat hourly rate for their tailored advice. 

The lot is almost perfectly flat which makes this significantly easier.