The only thing is, he mentioned that I will have to file an extension because, understandably so, he does not have the time to complete my small business returns by 3/15 (8 days from today).

Personally, I wouldn't offer SubTo or a Wrap, For reasons I've written about fairly extensively. https://www.biggerpockets.com/forums/70/topics/1227199-the-m...However, I would sell on "Lease Option" and that may work for you.

Why is the wholesaler not giving you an extension?

Sometimes they'll have gurus come thru that charge more for a full day class or more extensive training.I've posted before some lists of area meetups...each has a little different twist and following. 

Extensively commented on, no need for me to add to it.Warehouses is somewhere towards the bottom.

As a would be individual landlord with just a one unit single family property I don’t know I can stomach the risk or withstand a financial assault resulting from an eviction process for a non-paying tenant (or tenants that do extensive damage).I am seriously considering bowing out and selling.

To add value to the property, we undertook extensive renovations including the removal of over 40 yards of trash, installation of a new septic system and wall-hung boiler, and a new well pump.

Generally as a new fix and flip investor you would want to target cosmetic projects that do not require an extensive rehab budget.

They have failed to renew my entities with the Secretaries of State multiple times, have billed me wrong amounts, and GREATEST OF ALL, have cost my business ~$50K in cumulative TAX PENALTIES due to negligence in filing for a tax extension, failing to walk me through my tax filings and needed payments, and failing to file an abatement promptly.

To add value to the property, we undertook extensive renovations including the removal of over 40 yards of trash, installation of a new septic system and wall-hung boiler, and a new well pump.