Offer the design team a piece of the equity OR pay a premium as incentive to keep to an established timeline (that is within their control). 

@Matthew HoldenDo you have checkbook control or full custodial SDIRA?   

So although you have HOA dues, sometimes it isn't enough and you don't have control over that cost (if it goes up, special assessments, etc.).2.

Cheers, it's ballpark like algebra.You can't easily solve this:a + b + c + d + e = fBut you can easily solve this:44 + b + 23 + 13 + 48 = 155And, once you have solved that, you will likely be able to solve one with 2 unknowns, and work from there.

@Jeremy Bloom  the rag on the thermostat can be beat by placing a remote thermostat that is set to the legally required temperature with that remote thermostat actually controlling the temperature.

I'm a partner at Launch Control and a former Batch user.

I would tell folks at the time with 30k brand new homes that Lehigh was probably one of the cheapest places in US if not the world to live everything considered US medical and fire and police etc etc and no state income tax.So here we are today de ja vu all over again with hundreds of investors stuck with half built houses and a the vast majority of all these were spec for rental purposes not to live in..

Do you feel this is controllable or that it's mostly up to chance who succeeds and who fails? 

Also make sure you understand everything about adding an ADU including value of the ADYPU, financing, impact from rent control, duration between initial expense and initial income, true cash flow (know the 50% rule, at 50% rent ratio initial property tax will be near 20% of income)- educate.  

2) How often do you do pest control treatments?