Short and sweet as @Steve Rozenberg suggested and no need to explain why as @Nathan G. explained.I too have never had someone come back to ask why and that is because like @ John Thedford, I do a supplemental application package that details the qualification criteria (being very careful not to show anything that could be misconstrued as discrimination) upfront.That makes my life so much easier should one come back and want to know why.I work to keep it even across the board and if one does not meet the criteria they just do not meet the criteria.Application fee is also non-refundable, as it covers the screening costs and they are made aware of that in the add and supplemental package.

Especially since you like listening to podcasts:1) Start listening to the "Super Agents Live" podcast by Toby Salgado; great stuff in there to work as a Real Estate Agent.2) Start listening to a lot of audible books to supplement you podcasting. 

As a supplemental income I am thinking of building a studio over garage and renting it out as a long term rental or through Airbnb.My questions are: Would it make more sense to build entire second floor vs building a studio over garage? 

They do not have deep pockets to supplement a tenants rent or to buy cash flow with their own money. 

That's where something like real estate investing can supplement.

Do you believe it will be best to “purchase” the property from my parents in order to supplement their loan from a financial institution?

Let them stay and continue to supplement their rent.

If you want to be a home owner in SD, Its either buy a house which makes no money, or buy one which has an income and can supplement your mortgage.

Obviously I won't have to rely on that portfolio to put groceries on the table for most of my life but it would be a nice supplement later.

The initial and any replacement general manager or an owner/operator or other representative who exercises day to day operational authority of the Facility must attend the Strategic Training for Exceptional Performance or Advanced Strategic Training for Exceptional Performance training program as well as any supplemental Internet-based training the franchisor may require.