The size of the data sample required for accuracy is definitely key. 

I manage 8-12 unit buildings in Logan Square, Albany Parka and Irving Park, and we have had issues with porches even at that small sample size.  

I feel so much better with big picture plan, a detailed execution plan of the strategy, and created a data sample and a second data analysis using DealCheck.io.

The program had a very small sample size as there weren't many participants + as you mentioned, renovation/conversion costs were extremely high for landlords.For your question, an architect would be a great contact.

Search "sample lease termination letter" and get examples of what the notice should look like.

I can send you a sample contract, whats your email?

If you need a sample of forms we used, please send me direct message and I'll send to you. 

I have some sample contracts but you'll want to get them reviewed prior to use

The LTA handbook online also has some samples at the end for the 10 day notice to quit https://law.alaska.gov/pdf/consumer/LandlordTenant_web.pdf

Once you have a substantial sample size, itemize them on a Google sheet form and compare the Price, Price per square foot, Lot size, price per bedroom, etc.