Use AirDNA.co for market research.Search the immediate area, in "Traveler mode" to see what the competition is doing.All that said, I concur with the general sentiment of the above comments.You are already running tight. 

I’m looking to buy my uncles property off market for 35k cash.

Make sure they understand things like the fact that this project is taking a financial toll on you, that you need to get it on the market before the good selling season is over, stuff like that.

Airbnb brand is strong 💪 Correction, AirBnB marketing is strong. 

Reach out anytime and I can connect you with Property Managers in various investor markets that you can count on to help you or point you in a productive direction that you can trust.   

In many markets section 8 is higher than market rate. and investors need that extra return to mitigate the risk of sec 8 tenants generally speaking.

Does anyone know whether it is better to sell it when it is below market value or if it really doesn't matter?

At some point you buy and fix up real estate to eventually sell it and live the life you desire.One piece I would make sure to consider is the current condition and rents for the duplexes before you put them on the market.

I’m currently diving into the real estate world, focusing on finding off market deals and distressed properties as a bird dog.

By educating clients on lot splits and development options, agents can position themselves as experts in a growing segment of the market.