Garden-level or street-level ADUs are common in New York multifamily properties.

I voted no BUT that is a high level answer.

Everyone is gambling, and I keep advising my clients to please not compete with that level of moronic. 

An LLC doesn't provide you the ability to deduct something that wasn't deductible before.You also want to be wary of 2% itemized deduction which is what you are describing a lot of your expenses.They are currently non-deductible at the federal level.

Keep in mind he had the skills to make it happen, and he doesn't account for the cost of his time/skills.

This isn't a free weekend seminar, it's $10K to $30K up front.But let's assume that they are on the level.

This is when the program takes on another aspect of network (multi level) marketing.

Your response is based on your skills and personality, but I wouldn't even think of hiring an attorney or panicking over this issue.

In an urban market, level of finish and proximity to an attraction or location contribute significantly to demand for a specific home.

All cost seg companies will eventually point you back to having that conversation with your accountant, so starting at the accountant level is going to save you time