As long as the ADU is under 900 sq. ft. and meets the state building code, there will be no variance or special permit needed, so no ZBA or neighborhood meetings.

Also any tips for automating this as much as possible and how to protect the property financially and property management would be appreciated.I ALMOST understand the rental arbitrage strategy if building a company scaling with say 30 + units and looking for high short term cash flow.  

local PM here - I would master underwriting and build out your network.

Its a 12 unit building so lets say 2 persons per unit . 60x2=120 a day per unit 120 x 12 units = 1440 gallons Depending on area lets round it up to an even 2000 gallons . 

The area of the land is 26000 square meters possibility to build on it 25 floors.

I like the idea of focusing on bathrooms, curb appeal, and opening up the kitchen/living space.I’m definitely working on building a solid team, especially with real estate professionals who understand investor deals.

I'd be confident you'll have many takers.

3 seperate buildings, parceled as 3 seperate addresses so investor can get single family financing on this, is that correct?  

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We have taken over several buildings in Berwyn from clients who have moved out a few years back, and that I get.