Can the electrical conduits/wiring for the ADU be run under the primary house's crawl space up until the house's facade facing the ADU and finally underground for the remaining bit?

A typical project would involve a facade replacement, building mechanical overhaul or upgrade, vertical expansions, new or modernized elevators, restrooms and lobbies. 

You're going to want to take a close look at the lifespan of building systems, the facade, roof, boiler, etc.

Not $2,700 worth of difficult for sure and I could do it in 2 days max including assembly of the cabinets.Had a bid for $800 to tear down the top 2/3 of the brick facade; took us 1 1/2 hours with a hammer drill.Bottom line, hiring contractors would probably eat away about $20k in profit if I hired them vs DIY. 

The signage is on top of the building facade facing the main traffic area and is the only one on the building.

How much would you expect to pay for a new brick wall, say 2 stories?

Or are you asking now because you soon intend to engrave the name in granite on the facade of your company's headquarters? 

@will g. thank you so much, it just gets hard to continue to put up the facade in front of your family when something is, actually, mentally breaking you. 

Consider a new facade, etc to make it more appealing.

Lentil currently supports 2nd story brick facade.