Here's the backdrop....For the past 20yrs I've ran a residential design/build company. 10yrs ago I was able to get into REI and now have 6 properties total (2 personally (1-ABNB / 1-SFH LTR)/ 4 (LTRs) in a LLC with a partner), and manage 2 additional properties as the property manager. 2yrs ago I decided to drop the building side of design/build, and now I just do architectural design and REI.

(Some towns also have an Architectural Review Board that reviews the plans to help insure that no one builds some monstrosity that detracts from the visual beauty of the neighborhood, or something.)

(I made a list)My concern is more in terms of the architecture; bringing a commercial space up to residential standards :(

Additionally, the architectural design, the condition of the property, and the surrounding neighborhood also play significant roles in determining its value.

Therefore, it is essential for both homeowners and investors to keep a close eye on upcoming development projects in the area, as they could have a profound impact on the real estate market.Historical Significance:Properties with historical significance or unique architectural features often carry higher price tags due to their cultural and aesthetic value.

I am in love with its architecture and its communities.  

Walk through with the header table and start checking their lumber sizes... also works on architectural plans that call out header sizes.

For example, call a roofer and ask what their average cost per Square of Architectural Asphalt Shingle Roofing would be on a 1,500 sf house, with a 6/12 pitch.

How much architectural work is actually needed for an ADU?

I have a background  in architecture with experience in construction management.