KNOW what you get for different price points as far as quality of construction, cabinets, faucets, flooring, appliances, etc.

Construction is not something anyone wants to deal with or live through, so if the roof is on it's last leg and you know it's going to fail soon, I'd say replace it before you get your first tenants moved in.

I'm not flipping full-time and I think not knowing construction leads me to not know when it's time to start pushing harder. 

I encourage input and direct but constructive criticism of the deals I've been purchasing in this hot, maybe top or near-top of the market-cycle. 

I am both a construction manager and realtor. 

The multi families are few and far between, a lot of new construction apartments have started as well.

With the amount of development going on in 19146 and price points over 400k for finished new construction single family homes, developers usually snap up anything under 100k in any condition quick because that's about what vacant land is going for.

I've been working with relatives for years, worked with my old man for 22 yrs and pretty much the same with another cousin here in NY with our woodworking/construction business so I completely understand what you mean and where you are coming from but we've never experienced any issues in all those years even if we've had disagreements. 

He assisted me with my refi on my primary residence and now working on a construction loan for a investment property.

Make sure you run the numbers for what new construction residences are going for, and subtract out construction costs, cost to install utilities, developer profit, etc, and you can get an idea of what a developer would pay for the lots.