Even when it's not directly price, it's almost always a form/function problem (which still ultimately means it's not worth what you're asking in it's present floor plan, design, use, etc. so it still ultimately boils down to price).

A finished attic will probably be worth less per sqft than a first floor area.

Unless the house is a full gut to the studs rehab, I would be floored it it cost much more than $60/ft2.Midcity is on fire right now and buyers are paying way too much.  

Fully furnished, wash/dry connections in most units, new flooring, metal room, brick construction.

So if you have 3 floors that you need a custom rail.. may spend up to $3K max.  

DO NOT BE AFRAID to outline high costs for rehabbing to current code -- complete new wiring, plumbing, 100% new drywall, ceilings and floors, windows and doors, kitchens and baths --- porches, landscape-- are not cheap.

I can either rehab the first floor bathroom, which desperately needs to be done or rehab the kitchen.

She is asking 110K for a property that has a partially finished second floor addition.  

You just need to make sure you water heater is double strapped, make sure the appraiser has access to the attic for a " head and shoulder view " Also make sure all flooring is covering every inch of the base or concrete.

You can cap it, but you are required to have a floor drain.