I know several larger orgs that I invest with who will only work with Accredited investors via 506(c) but I've also invested on a few smaller projects that accepted Sophisticated investors, or non-accredited, via 506(b). 

I submitted an offer through the owner, but person didn't accept. 

If they don't accept your offer, that's fine - just move on to the next seller.

But the sellers have already accepted my non binding initial offer of $350k and I'm wondering if I should risk lowering my offer?

Let me first provide a little context on where we are at with the deal and the overall condition of the property.My intention: Primary residence- 2 yrs, then rentalLocation: Denver, CO (Very high growth neighborhood, this deal was almost all dumb luck...)Condition: House is B Class, recently remodeled, 3br, 2ba, huge yard, carport, shed, new roof, everything about this house is above and beyond what I consider move in ready.Asking price:  $399,000Days on Market: 27My Offer: $375,00 (Accepted)Contingencies: Inspection, Appraisal and Seller allowed to live in the property for 9 months after closing while new build is being completed.The seller is in a position where they need capital to finance and complete the build that has already broken ground on their new home. 

It would seem difficult to accept a challenge of 90days when you are starting from ground zero.

I do also accept private money loans as well and found these easier to work with overall.  

Later I was not satisfied with her home searching skills or Negotiation skills...I switched my Agent then the other Agent showed me a good home, we made a offer and also the sellers accepted it.Now somehow the other agent got to know it and saying that I had signed a Buyer Loyalty agreement for 1 year and harassing me to pay 2000$ to her for showing those 5 houses or else she wouldnt end the contract.

They do not consider I am in "business pursuit" and that's why they accepted to protect my units with the associated liability under my current policies. 

Ask the title co. you plan on using for a PIA acceptable to Them.