The city is willing to work with me and won't charge me anything for the permits, but I have to have the mobile inspected by them, which I am not worried about.

How is the loan structured and what does the bank charge for that?

I was browsing airbnb to try and find our what I could charge for a new house.

I asked both of them how much they charge (which is the same) and the realtor that flips gave us a descriptive detail on why, while the other did not (raised a red flag to me) Now they both are assuming that we are going to use them... 

Monthly interest charges are based on the outstanding balance that Day

If you're getting a mortgage with a low (<20%) down payment, then your lender may charge for mortgage insurance. 

I've heard life hacking, credit card hacking, airline mile hacking, etc.

Just trying to get an idea of how much one can reasonably charge for on site parking.

My thought would be to find out the cost of rekeying it and charge the tenant the cost of rekeying the mailbox.

However, if using a PM who would charge a 1 month rent fee for resigning a tenant to a 1 year lease, I would prefer to let the tenant automatically roll over to M2M to avoid that fee.