This might reduce the time and resources you spend finding buyers for each deal, which could, in turn, lower your marketing costs and the need for extensive negotiations.Also, to clarify, the exclusive buyer agreement would only apply to the leads/addresses that the buyer provides.

A construction lender may be willing to take out your current loan and use the home as additional collateral for the construction reducing or maybe even eliminating any cash needed for the development phase.

Ideally, you would have money for down payment in savings and use a HELOC to find the rehab to reduce your hard money costs.

Generally most people you speak with are going to provide you a quote with their "standard" commission built in and anything less would be them taking a reduced commission to win your business. 

I personally never hear stories of the turn key provider spending extra sound proofing between units or investing in better quality fixtures or other high touch building materials so that the end buyer can enjoy reduced maintenance costs and better tenant engagement.

You ask them their challenge and there is typically an option that reduces the challenge.  

This reduces the rate of interest by 2% the first twelve payments and 1% payments 13 through 24.

Their capital exposure was reduced by 200%+.So now they own the house and work is being done. 

You're not purposefully causing the sun to expend energy on the home.

Investor Consequences: Restricted Cash Flow Growth: Investors may experience reduced income over time since rent increases are typically capped below market levels.