One side has a full bathroom in the basement, giving it 2 full bathrooms, and the other side has 1 full bathroom with the capability of adding one to the basement.

I just am anxious/impatient to get to my goal of 20+ units and I thought the seller financing might help me get all these properties and hit my numbers...It doesn't look like there are many in this area with the capability of buying these type of multi-units (most investors in this area are buying SFRs) so there isn't a lot of competition for the deal.

I have no experience of RE investment so I really hope I can get some great wisdom advises and connect with some key players to help me get start it.

. $1 million is an exceptionally low limit for a portal, and would force it to forever be a very small/bit player. 

The team has having power of attorney and manager capabilities in the LLC.

Your question is too vague for any of us to have an interest until we know what you are trying to do, and are capable, of doing!  

"Accepting" a cap rate only means you are not a market player if you are shopping for a 12% cap in a 10% market OR are overpaying if you accept 12% in a 14% market.  

He's one of the big players in the Philadelphia market and has been wholesaling this way for years.

There are many people out there capable of closing these deals.

Why, because experienced players like @Gino Barbaro will tell you that all expenses are fixed, and very often what we know them to be is rather drastically different than what's being sold to us by the pro-forma.If you consider, for example, 10,000 C class units within a specific tri-state area, you will notice that pay roll averages x, R&M averages y, utilities average z, etc.