The exhaust vent goes up, then downward and into the patched wall.  

(Doors Material)$2,500.00 (Vanities/Tub Material)$1,500.00 (electrical materials)$2,500.00 (Granite)$500.00 (Baseboard materials)$300.00 (Door Trim)$500.00 (Faucets/shower bath fixtures)$1,650.00 (paint labor and material)$400.00 (Water Heater)$750.00 (Carpet labor and materials)$2,500.00 (appliances)$1200 (light/fan fixtures)$750 (plumber labor)$250 (wood beam material)$100 (new ac Grills)$500 (drywall patching labor and materials)$200 (master bath mirrors)$200 (master bath shiplap)Costs to be incurred but not seen in pics. glass for master and guest bath. $2200.

The great thing about major rehabs is the whole place will need to be patched and painted.

10 month compete cosmetic rehab, added a kitchen, added window in cinderblock, siding work, chimney removal, roof patch, roof paint, all 4300sqft needed work and we (my family, friends and I did all of it) What was the outcome?

I would need to do about 15 to 20k in updating, patching, paint, flooring, etc  to get it rent ready.  

We have a building that has a pretty rough roof, One section has been patched and I'm thinking we need to just replace the thing.

Allow me to clarify...I am doing the hard stuff: wiring, plumbing, windows and doors and wall patching....then cleaning and painting....which only leaves fixtures, cabinets...etc

As far as holes in the walls, it is unfortunate that some tenants use large nails to hang pictures and they make other holes in the walls for who knows why, but repairing even large holes 12" x 12" inches won't bust your piggy bank because we freshen every unit when a tenant moves with a coat of paint and if you are using a painter worth his weight in salt then he should be able to patch a few very large holes within 1 or 2 hours and the cost for materials should be no less than $30 to not one penny more than $50.You will just waste your time and aggravate yourself by feeling your are a victim and you have been violated.

Where the roof leaked and was patched you also need to look in the crawl space and make sure there is no rot or mold on the beams between the ceiling and the roof. 

I have done  major renovation (no such think as basic fix up for a Victorian) on a dozen Historic homes, that had all been bypassed by other investors.You're dealing with +100 years of various owners patching over problems.