To alter a month to month rental agreement you need to give them a written notice, typically 30 days before it takes effect.

I realize this effectively reduces the sale price of the house significantly.

Since your mom will be loaning you the money, gift tax should not apply but as suggested by @Michael Le $14k of that money could be gifted tax free and not loaned effectively saving you interest on the $14k.  

Honestly, there are many faster, cheaper, and more effective ways to gain actual-useful-real-world experience.I'd be happy to answer any questions you might have about the Real Estate MBA program at UW-Madison.

And it would be even better if you could sell the 4 to the same buyer, to reduce cost and uncertainty.But, in effect, your Replacement Property for each of the 4 Relinquished Properties would be a  1/4 interest in the new property.Hope this helps.Michael Lantrip

closed on a quadruplex property with 3 tenants in Athens,GA.Need a property management company who provide great service and cost effective management rate.Any recommendations 

This implies if you are doing forced appreciation, actively leveraging, performing profitable flips, etc then you can make significant money because you in effect have made RE a business. 

How effective would this be?

Unfortunately the recent interest rate increase has in effect significantly raised the price on financed buy-n-hold RE.  

Then find yourself an accountant and attorney who are well versed in business and real estate and lay out a road map to reach your near, mid and long-term objectives in a cost and tax effective manner.