However, based on occupancy & rental for STR's, and my extensive and ongoing discussions with other realtors, investors and other professionals such as contractors, inspectors, title agents and architects- most investors outside of my sphere are seeing 10% -18% net cash flow, compared to most of my clients receiving 13%-25%+ net cash flow.

i got a architect/structural engineer that handles all the design and permitting. 

It was easy as that but the architect hasn't finished drafting up the plans so I have yet to apply.

The half duplexes in the same neighborhood are selling for $600k.Besides Landmarkk, the leading Tandem House architects in Denver are:Becky Alexis (mainly NW Denver)Niccolo CasewitBrian Pearson (Denver and all Suburbs)Kung Architecture

Smith, RA - Principal Architect at Architect Owl PLLC (Licensed in NY & CT)  

Smith, RA - Principal Architect at Architect Owl PLLC (Licensed in NY & CT) 

A lot of the things that an architect/designer does for you is to navigate local building codes and zoning laws.

I'm an architect and builder and this is what I absolutely love - designing and building new projects, and in this case, acting as my own client!

That was because Architect had illegal plans, the Builder built columns not sufficient to support the underground parking area and the Inspectors were all corrupt.

Have a local architect (whom could help with plan, permits and filings), to check this feasibility before considering this option.