You are going to privately lend an investor on this deal and you will offer them 85%/100% at 10.99%. 

After doing a web search, I wasn't able to find much information about invest1, or the properties they offer, which concerns me a bit honestly.  

:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+, zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680, some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

Additionally, I offer my clients my experience as an investor as well as my network in order to help them accomplish their goals.

But, if things go well. so far, i've heard from my brother that the owners of the property we are aiming for, are being difficult and wanted us to make the offer before looking inside the physically looking inside both the units of the duplex. 

The likelihood of all of these occurring is low in a typical subject-to transaction. 

Texas has a lot to offer, and it sounds like you’re on the right track!

On market, offered 30K below asking and got it How did you finance this deal?

On market, multiple offers so had to pay above asking.

For $150,000, this could be $3,000 to $7,500.Investing in a Rental Property: Costs and ExpensesDown Payment and Closing Costs:Down Payment: Assuming you buy a $300,000 rental property, you need a 20% down payment ($60,000).Closing Costs: Typically 2% to 5% of the purchase price.