I’d be disappointed at flat rents, I can’t imagine a 15+% rent crash.

You may pay a bit more and make a little less, but playing the long term game is key in real estate.The types of structures could be lump sum (one price) or cost plus (meaning you pay the cost of material and labor plus a flat fee—more of an open-book model).I see some investors who want to pay for ALL the materials, which is excellent for the investor (more control of finishes & cost) and general contractor (if they are getting paid well).  

My insurance company stated they will not be renewing my property insurance policy due to my flat roof.

These are sometimes referred to as in-law units or granny flats and they are not new to the commonwealth but a favorable ADU policy has the potential to add over 10,000 units and offer homeowners a potential source of income.As a lifelong house hacker, my wife and I immediately recognized the potential of this 2-story garage in the back of the property.

For example, we once charged a flat $300/month to do bookkeeping for up to 5 properties and roughly 5 different accounts.

Challenge is finding an agent willing to do this - so, you may have to offer them a flat fee for each offer.

Hi Jaden,I'm not a fan of hybrid turnkey models like the companies you mention.Also, not a fan of many turnkey marketing companies.Granted, I'm bias but if anyone is interested in turnkey just go straight to the provider.Not many around these days anymore and the one's that are, have stood the test of time and are obviously solid.I think it's less riskier nowadays to invest in turnkey properties than before because all of the poor providers have disappeared and only the good one's are still around.Plus, seems like the "hands off" and so beloved syndications are going belly up so turnkey might be in fashion again.And no big deal IMO that turnkey is not completely "hands off".Is anything completely passive other than 30yr Treasury Bonds?

I am building a vertical addition above the existing main level which would have vaulted ceilings OR alternatively the front half would be vaulted and rear where the bath/closet is situated would have flat ceilings with rooftop deck above.    

It’s called “flat rate” billing.

I recommend you add a little more detail to this post.. what kind of property etc etc.I have done probably more than 12 to 15 deals in south side all 2 to 4 flats.. at first they all sold to investors the last 3 or 4 sold to owner occ.