There is no replacement for looking up the city zoning code and seeing what it says.

My go forward strategy is take these homes that are in good condition, maybe even lightly renovate them and turn them into standard rentals, on the older ones there still may be resale or scrap value I'll take that on a case by case basis and then begin to Vet incoming tenants and establish a "housing code" so to speak going forward on appearance...this will be a multi year strategy as I can't just kick the old homes out and find great new tenants over night but I'm confident over 5 years I will greatly improve the appearance and there for the rent value

I have 'pulled' permits (always under $30,000 and for existing buildings (all Level 2 Alterations)) and you'll need to meet 87-14(1), specifically, if you are not licensed in the state.

@Douglas KrofcheckIf you have four separate units and wanted to install a central vacuum in each, it is possible each would need to be plumbed separately {for fire code reasons} - either back to a common mechanical room or within each unit - requiring a separate canister/motor to be installed for each.While a central vacuum would be a nice perk, I doubt it would be cost effective - it would likely be cheaper to finish all the units with hard flooring (no carpets) and buy a $50 Bissell Power Force bagless vacuum for each unit.  

You will have to show the planning dept. existing and proposed plans, with a demo plan showing any existing parts of the house being altered by construction.

It may just require altering my approach.

I am looking to put offers in an entire zip code in my area.

To alter a month to month rental agreement you need to give them a written notice, typically 30 days before it takes effect.

It's a revolving door,, If you choose to do this rent by the room, you will need to put a room number on each private room so if you ever have to file a eviction the room is designated,, I would suggest the electronic key pad type lock for main entry and one for each private room so easy to change codes.

Unless you are familiar with codes and the correct way to do things.