I might think the tenant has poor manners in a situation like that but I wouldn't feel aggrieved in any way since they are just my customer not my friend.

You might have a challenge with tenants/customers feeling uncomfortable next to a prison so getting the local insights might be valuable to you as well. 

Maybe some specialty programs exist for prefab homes or a custom ADU builder might have his own lender partner they could refer you to... but unless you yourself are an experienced home builder with a track record in ground-up construction, you're basically looking at a hard money or a HELOC.

Alternatively, I could go with a custom design; what should be a ballpark price for all architectural and construction related plans?  

I've seen some where the screen does not open while others have the classic squeeze-to-open.I ask because if they do not need to open I can build them myself but otherwise we have weird dimensions and will have to pay $$$ for custom...Thanks in advance!

A super basic step one would be to set up a "newly listed within the last week" custom search on Crexi, Loopnet, whatever.

Scope of Work:Initial Assessment: Our team conducts a thorough assessment of the property to evaluate its current condition, identify structural issues, and determine the scope of renovation required.Design Concept: Collaborating with architects and designers, we develop a design concept that blends contemporary elements with the historic character of the row house, maximizing space utilization and optimizing layout efficiency.Structural Repairs: Structural repairs and reinforcements are undertaken to ensure the integrity and stability of the building, addressing any foundation issues, roof leaks, or structural deficiencies.Interior Renovation: The interior of the row house is completely renovated, including the removal of non-load-bearing walls to create open-concept living spaces, installation of new flooring, upgrading electrical and plumbing systems, and installing energy-efficient fixtures and appliances.Kitchen and Bath Remodeling: The kitchen and bathrooms are transformed with modern finishes, custom cabinetry, quartz countertops, and high-end appliances, creating functional and stylish spaces for daily living and entertaining.Historic Preservation: Special care is taken to preserve and restore original architectural features such as exposed brick walls, decorative moldings, and hardwood floors, enhancing the property's historic charm and character.Exterior Enhancements: The exterior of the row house receives a facelift with fresh paint, repaired masonry, restored windows, and landscaping improvements, enhancing curb appeal and contributing to the overall aesthetic appeal of the neighborhood.Quality Assurance: Throughout the renovation process, our team adheres to strict quality control measures and standards, ensuring that workmanship meets or exceeds industry best practices and building codes.Finishing Touches: The finishing touches, including interior decor, lighting fixtures, and hardware, are carefully selected to complement the design aesthetic and create a cohesive and inviting atmosphere.Timeline and Budget:The single-family flip project in the Philadelphia row house is estimated to be completed within [timeline], with a budget of [budget].

(This simplistic one will normally get around privacy issues since you don't request names).Bad: I would like address for all your customers.

The key is not every custodian is right for you, some have higher fees but better customer service and some are good at real estate and notes and others not so much.

Thoroughly research the industry, field, business you’re interested in to see if there’s a “niche”, unique approach, unserved customer base, or anything similar that can be exploited to earn income 3 standard deviations above the mean.