I don't remember the exact figure, but what surprised us was how similar their cost came to the stick built home we chose.  

I am working with the city for approval and have a cost estimate from someone I know of 250k to build another duplex on the property and eventually multiple duplex.

Building costs here are astronomical.

This could result in lower financing costs.

Feel free to DM

Since inflation was so severe for the last few years, they had essentially decided to raise interest rates aggressively in order to fight this high inflation even if it came at the cost of slowing the economy down.

So they have to be placed & picked up quickly, or at the very worst cost so little that it doesn't matter at all if the authorities remove it. 

Further, you now own a “free and clear” property you can borrow against should you desire and probably get all your invested cash out.3.

Our intent was to sell, but we are not having luck and need to move in another direction, carrying costs are draining us. 

Quote from @Kenji Van Thuyne: Start with BiggerPockets Ultimate Beginners Guide (free).