Other properties don't have the architectural feel that I would like in a vacation rental.  

@Douglas Larson  Mid Century Modern is an architectural style.

Also, the Architectural Barriers Act provides guidelines too that can impact our industry.At this juncture, it sounds as though the tenant is in violation of your rental agreement and has not done what is necessary to be covered by the Fair Housing Act, which is enforced by HUD.

Ive been passionate about real estate, investing, development, architecture and cities all my life.

My background is in Architecture and development, so I can appreciate what you're saying about development.  

I've worked on several ADU projects and the design, architecture, engineering costs have netted out in that range.

How are architectural plans not for construction purposes?

We import and sell reclaimed architectural building materials from Europe - think antique stone flooring/mantelpieces/doors, etc.  

Long time interest in real estate (majored in real estate finance), architecture (accepted to school, did finance instead) and design.

I already have architectural drawings for the entire project.