The issue with hoarders is damage to the property- hoarding can lead to pest issue, moisture issues and other issue that physically damage the property over time and can lead to big $$ repairs. 

Where ever you get leads on agents ask questions about how how they like to communicate, what their time availability is for you, why they want to help you, and how they will be valuable to you in your journey in achieving your goals.  

The hassle of it all - directly communicating with and qualifying potential buyers, constantly scheduling showings, understanding the paperwork, contracts, contingencies, and timelines.....all cause some sellers to give up on selling it themselves.

Yeah mate,Too much outside influences and logistical issues with new construction.It's much easier/less risky when you control as much of the process as possible and don't need approval from anyone for "this or that".New build works in other markets but why would anyone new build in 43612, 43613 or 43623 for example when they can buy dirt cheap and renovate for much much less than new build.Just my opinion and there are many ways to skin a cat when it comes to real estate investing 

Dealing with the Original Asking Price Amid Broker Involvement: When a broker becomes involved, and the deal's dynamics change, it's essential to maintain clear and direct communication with the seller.

Goals is adding an ADU when remodeling a distressed SFH, but so far none of properties we completed worked for it (zone issues, lot size, garage storage > ADU value). 

I think it's important to have great communication with tenants.

Should I include security deposits I've received and then forward to my owners in the 1099 I issue them? 

Of course, there are potential issues like alligators, higher flood insurance premium, erosion.

The main issue is that rental rates on the new construction make it challenging to cash flow much, if any, in the first 3 years.