Took one booking, the tenants broke contract by bringing a pet (dog hair and a bone were left behind), and Landing was not exactly pleasant to deal with in recouping security for extra cleaning and damages (dog used the ceiling fan remote as a chew toy). 

You can deduct that from their security deposit, send to collections or sue them. 

How can I structure the contract or investor payout terms to ensure they feel secure and confident in receiving a solid ROI?

We embrace S8 applicants, but screen them just like any other applicant.Many have an entitlement mentality and try to leverage their S8 voucher by pretending to be helpless:1) A percentage won't apply because they expect a landlord to waive application fees for them.2) Many cry broke and expect a landlord NOT to charge them a security deposit.3) Many of those same S8 tenants trying to avoid paying a security deposit, won't make an effort to call the list of nonprofits we send them that will pay their security deposit if they apply.4) A lot of them try to avoid paying for utilities.

The county is the second fastest-growing in the U.S. and the fastest in North Carolina.The zoning for the project is already approved, and with our captive audience of potential tenants, I’m confident that all units will be leased upon completion.I’m seeking advice on how to best structure this debt with a private investor or investors in the short term until the property is fully rented and long-term financing is secured.

The vast majority of lawsuits against Landlords are for wrongful eviction, security deposit disputes, and Fair Housing Violations.

I have looked into multiple "Angel Investor" sites (invstr.com, pitchbook, askforfunding) as our company is growing and we need to secure funding before we turn loans away.

Does a landlord let a tenant move in without first month rent and security deposit ?  

I used a conventional loan to secure the property.

A return of 8-12% is generally considered good, but it will depend on your personal goals.Risk with Repairs: Major repair costs are always a risk, especially with a wide range like $145K - $200K.