"Average" rents aren't super helpful because a lot of factors, location, size, condition, characteristics come into play so always best to pick out some comps around the subject, then start "adjusting".

I write that in order to keep the historical aspect of the house, and because the house is over 100 years old, many of the original characteristics do not meet the current building code such as the height and width of stairs and the height of railings. 

These are people who share motivational characteristics of people ready to sell, but haven't yet done all the work they think they need to list property.

In a similar fashion, each park is unique and will need to be valued on its own characteristics and merits. 

Since you have a Pro tagged to your photo, I want to ask and only if you’re able and willing to answer, in all your readings - rich Dad, millionaire investor and so forth, what do you find to be an important characteristic or trait a real estate investor must have?

There are plenty of side vents that while looking somewhat unsightly work just fine and have no issues with bugs or birds.

Once I understood this, I turned to studying Las Vegas historical tenant behaviors.I tried different approaches for isolating a segment with the right characteristics, all of which failed.

Furthermore, tools are normally not provided.There is case-law giving further support/characteristics between the two different relationships.

If said characteristics would've fared just fine without you over a given period of time (maybe the local police are top notch), you've produced no value during that period of time.

I do know that on certain properties there is no interest due to the property characteristics.