This is clearly a cost of doing business from a practical perspective, but is it also considered a tax-deductible cost in the eyes of the IRS?

As noted above, it's best to find an attorney who practices in the state (and possibly the county) where the property is located.

The answer to this question is always "Yes" ... not only is it a code requirement for bathrooms to have ventilation, it's just a good practice!

. - Once you have some knowledge and practical experience, go out and find a great deal.

I would guess(it makes sense to me anyway) to keep each property in a separate LLC so the assets are not united, not have a Master own other LLCs, but that will depend on how your state sees these structure legally….this is where you need an attorney that practices corporate, RE(landlord-tenant law), contracts, and bankruptcy to name a few in NC.

Double closing or simultaneous closing at a minimum... or better yet use transactional hard money loans and close with your buyer the next day.  

I want to help my broker form a landlord rep practice, and get in to larger scale commercial transactions too.  

I've held off from removing all of the copper in the past because it's practically new.  

You basically have two options available: an instalment sale: the buyers purchase the house from you using X number of regular payments over Y years; or a purchase option: you simultaneously execute a regular rental lease and an option to purchase the property at a fixed price at some point in the future (3-5 years).  

I feel like I have a solid understand of the REI concepts and fundamentals, I felt like practicing on comps was the next logical step to take, should I be doing something else or am I on the right path?