I am still rather new in the investing world, but I know with enough base knowledge and liquid capital of course, I'd be willing to pursue it for sure. 

I think working on getting liquid capital for these projects is step one for me.

It's not that complex.It's all about cash.  2 forms:  1) Liquid, as in cash out of pocket (cost) and cash into pocket (cash flow). 

I understand the rate is competitive on the assumable, but having $300k liquid, you might as well do a lower downpayment and Buy down the rate. 

Credit 700+, bank statements available, good liquidity position (almost enough in cash to purchase the property - but obviously know that's idiotic).  

I am proposed GP with development / management experience, however my liquidity is tied up in a separate development initiative. 

You have 80K liquid depending on the property type you can put 15% down on a investment property.

Not only the initial fees, but there are also liquidity requirements, i.e. $300k loan needs to show $15k liquid assets, and draws typically require you to pay contractors and obtain a lien release before you can be reimbursed for the money you paid contractor.While I know there are a lot of people who use low money down loans to get started, it is risky.  

A heloc can "never" be used as an "Asset" or Liquid reserve both required when you purchase additional rental properties. 

Could be that the funds that bought the loans are liquidating, or it could be repositioning in preparation for future business.