It is a common concern, I think if you are writing competitive offers then you can request a discount.

Yes, this is very common in probate deals. 

If you have a flat roof with drains, or a pitched roof with gutters I would ensure either way that the flow of water is un-obstructed most commonly by leaves or pine needles from trees.

For walls in common areas like halls and stairs, there are rigid products that can absorb some sound.

The more common one is a flat value for the ADU, like they would for a pool or another bonus.

Should I try to make the deck on the second floor a common space or as part of a large bedroom?

.🚨 Common issues I see:❌ Not properly tracking repairs vs. capital improvements❌ Missing out on cost segregation & depreciation write-offs❌ Scrambling at tax time instead of planning proactivelyI’d love to hear from the group—what’s been your biggest tax headache as an investor?

For govvy loans, the Due on Sale clause will be available to your note holder - having an LLC take title to the deed (most commonly via a quit claim) will expose you to this clause.

Could the shared management function create a "common enterprise" argument that might compromise the intended separation between series?

Do you think it's common for a tenant to sue for an amount greater than insurance can cover, then take your property or even your personal assets?