In the package the wholesaler offered the sale price, the rehab bids, and the comps that supported their ARV.Are there just not anymore good deals out there from Wholesalers or are Wholesalers making a lot of profit from the deals?

You can do the same with mortgage brokers, which will accelerate the process because they will know the active lenders in your market and their requirements.You are also going to want to learn the different loan structures that are available so that you can match the structure to your project, especially if your project has a rehab element to it.  

This will be a house hack with some BRRRR elements as well.

As a newer investor I am interested in how to create a "One Sheet" or "Confidence Package".

I would call around some local banks and see which package would work for you.

I have been through the property and nothing too scary was found.Owner is asking $815,000 for the package. 

Then there are a ton of companies the repackage and resell data from primary suppliers like credit reporting companies and Lexis Nexus.Most sell one day or one month packages, so you can try a few out.

I believe investor concentration was one of the factors positively affected.I purchased a 3-unit condo building last year, where condos were nonwarrantable on the basis of investor concentration among other factors, at what I consider to be a "package" price.

It's the complete package - deal sourcing, marketing, repair and ARV estimation to liquidation.  

Note, that the first three elements BRR (Buy, rehab, rent) is no different from buy and hold.