Enlarged bedroom #1, replaced all flooring, install new HVAC system (install central rather than use window units), replace dilapidated siding, install fencing and exterior curb appeal.

I called a plumber and City PWD for inspection since I didn't want bigger problems (enlarged holes etc.) down the line.

The scope of work done was the master bathroom was enlarged to fit a tub.

Replaced the furnace for a high efficiency one, ran CAT6 networking to all rooms, enlarged and replaced 4 of the basement windows, replaced the suspended ceiling for drywall, installed 11 (yes 11) interconnected smoke alarms and sprinkler in mechanical rooms, repainted basement walls, replaced one of the rooms flooring, added gravel to the 3 parking stalls (currently was dirt).

A nonconforming use is a use of land, buildings, or structures that was lawfully established prior to the effective date of this ordinance, or any amendment thereto, but which does not conform to the regulations for the zoning classification in which it is located.Nonconforming uses may be continued subject to the following limitations:a) No nonconforming use shall be extended, expanded, enlarged, or moved to occupy a different or greater area of land, buildings or structures than was occupied by such use at the time it became nonconforming; provided, however, a nonconforming use may be extended throughout any parts of a building which were specifically designed and arranged for such use at the time it became nonconforming.b) No building or structure devoted to a nonconforming use shall be enlarged, extended, recon­structed, moved, or structurally altered unless such building or structure is thereafter devoted to a conforming use; provided, however, such building or structure may be enlarged or extended upon prior authorization from the Board of Adjustment, which authorization shall not be granted unless the Board of Adjustment makes each of the following findings of fact:1) The proposed enlargement or extension shall be de minimis in relation to the existing building or structure.2) The proposed enlargement or extension shall not increase the intensity of the nonconforming use, which is to say, it will not result in an increase in dwelling units for a residential use nor in gross floor area for a nonresidential use.3) The proposed enlargement or extension is designed so that it will not render the use of the property any less compatible than it is in its existing circumstances.4) The authorization of such proposed enlargement or extension is not otherwise contrary to the public health, safety or welfare.c) A nonconforming use of a structure may not be changed to another nonconforming use unless such change is authorized by the Board of Adjustment.

There are sections of the crawlspace I cannot access for subterranean termite treatment, as well as running new electrical for an AC system, I kept thinking there may be a hidden opening covered by flooring, but if I can't find it then I need to crawl down to the 16" headroom crawlspace with a corded rotary hammer strapped to my ankle, crawl ony belly for over 40 feet to enlarge the congested opening so I can pass through it. 

(You will need to click on the image to enlarge.) 

Take pictures and then go home and enlarge them on your laptop.

A picture is attached of the current / proposed layout (I'm not artist)My predicament is that I want to maximize my rent but I'm not sure if it will justify the addition of a wall with a door, the removal of a current door and the replacement of that door with some wall, the enlarging of window to make it meet egress standards (not positive on this one but I think I have to do this), and the removal of a closet to make a section for a door.

Basement:- Ikea Kitchen w/ laminate countertop- new standard doors/frames/hardware (lowest prices ones)- New Ikea washroom vanity/fixtures- convert existing shower to bathtub (standard)- stainless steel appliances (get lowest priced ones)- stackable white washer/dryer (get lowest priced ones)- pot lights in living/kitchen/hallway- standard light in bedrooms- enlarge livingroom window (to get permit)- new flooring - Luxury Vinyl planks- AC/furnace/Roofing - 16 yrs old (should I replace before refinance?