You may need to open up more walls than you think to re-wire. 

I work on Wall Street.

The bigger companies get hung up on knob and tube wiring that isn't even on the inspection report, because it could theoretically be lurking in the walls

We are going to be removing 2 walls, renovating the kitchen, one bathroom and all new flooring and paint.

If the landlord proposes to retain any portion of the security deposit for rent, damages or other legally allowable charges under the provisions of this act or the rental agreement, the landlord shall return the balance of the security deposit without interest to the tenant within thirty (30) days after the termination of tenancy, delivery of possession and written demand by the tenant.

If the neighbour turns out to be the problem you can expect to have issues retaining tenants so it is in your best interest to do everything you can to resolve the problems.Responsible landlords do not ignore problems with neighbours.

Sometimes it may just be removing meters, knocking down a wall, placing a door, removing the range, etc. 

But neither can be accurate if they don't take into account the floor plan, condition of the mechanicals (electric, plumbing, HVAC) and structure (roof, gutters/drainage system, foundation, doors, windows, walls, woodwork, special features) and furnishings (cabinetry, floor coverings, window coverings, appliances, lighting fixtures, plumbing fixtures) and land (zoning, location, yard size, landscaping, fencing, nearby attractions/distractions).

However if the house has a few decades of age and the floors are fairly flat and level and the walls fairly plumb (not perfect, just not way out), and there are no horizontal cracks visible in the walls or concrete, then you don't likely have a foundation problem.

This will be a big job because the bed bugs can really go anywhere in the units, the carpet, between the baseboard and the wall, and anything else that has a place for them to fester.