Don't mess around or delay, contact a RE attorney like Brian Hanis in Kent,  Landlord Tenant Services in Seattle or Dimension Law in Tukwila. 

In that case, I request to review prior to purchase to check specs, measurements and dimensions (depending on materials of course) only because I have been in situations where the homeowner selected materials and it became a disaster because they did not measure anything. 

Get rid of that straggly bush at begging of sidewalk.Update the current stoop column to a square wooden one of similar dimensions.

@Nicholas Baker Wood , your post needs to become MUST READ for any class D MF investor Would this one additional dimension help gauge likelihood of success, Namely: what is society doing to improve the lives of Class D neighborhoods?

You can get a much better sense for the properties dimensions compared to 360 photos or photos in general.

Lot size and dimensions?

But there are other dimensions that [seem to] compel me to take a proactive approach.

For the remaining windows, in less-conspicuous locations, I am considering installing new double hung wooden windows matching the style and compatible with the dimensions of the originals, for example: https://www.homedepot.com/p/JELD-WEN-33-375-in-x-4....Doors - The front exterior doors are deteriorated and the security doors do not match.

Assuming you have the proper zoning and lot dimensions it is definitely possible however not the simplest process for a novice to take on by themselves.  

You give them the dimensions, and they will cut it to the exact.4.