Since you already own a couple properties.Really just drive around, find beat down houses then start dialing. 

There are programs that are 25% down for a single family rental investment property and 30% down for 2-4 units.

The in-place plumbing will overkill, so if over time you lock and shut down a couple bathrooms (so you have less to maintain), whatever. 

Was thinking maybe selling and setting the remaining 30% in a trust for remaining heirs in case they popped up down the road but unsure. 

I'm trying to assemble a group of like-minded people to take down deals and improve each other individually.

The house we are moving to costs $400,000, and we plan to use part of the loan amount for the down payment on this new house.

But I am struggle to see if I should down more or less (10% or 20%) on it.

Cutting down timelines to not extend carrying costs Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

If it was an investment property then some would consider it but it would still require 15-25% down payment - as some lenders will do 85% of purchase + 100% renovation but no more than 70-75% ARV.

The NWMLS Buyer Brokerage Services Agreement breaks down how this works.