If you aren't, there are other options that don't require those.

However, we do have a few hybrid properties listed on Airbnb with a minimum stay requirement of 30 days. 

I would like to pass on a little bit of useful information for anybody thinking of converting their permit over to owner-builder. 1 - You will not be able to sell the property for a minimum of 365 days from the date of issuing of the CO. 2 - The property must be for the owner's own use and occupancy and not for sale or lease which means you will not be able to rent it out. 3 - The owner-builder must ensure that all employees working on the project have the required licenses.4 - The owner-builder must provide worker's compensation as required by Florida law.5 - To apply for the owner builder permit, you must physical visit the building department.There are others requirements and conditions, however these are the main items.

It amazes me how much random transient travel it gets(bowling tournaments, pawn shop remodels, manufacturing employees, traveling photographers, etc). 

Why would capital requirements be any less than traditional development? 

If you ask the manager to justify a fee and he starts hemming and hawing, move on or require them to remove the fee.

Moving walls usually requires figuring out what is or isn't load bearing and likely putting a large and usually expensive header.

Are some of your bigger buildings more than 16 units (requiring an onsite manager)?

One of the properties is a three bedroom with no garage that the tenants pay on time but require more of my time than the others .

Home was nice 4 Bed 3Bth under $550K with a decent size lot/yard and it only required 5% down as a New primary.Now I am not sure how big of a home you need but as you can see $100K covers much more in a scenario like that one above.