The kitchen offers sleek stainless steel appliances, a spacious kitchen island complete with seating, a large pantry, and an adjacent dining area that provides plenty of space for entertaining.

I've been using Skyline Steel from SW with Folkstone for the trim. 

@Jim K.Slides are steel though

Sometimes you can tell because of rust staining and buildup on the outside of such affected pipes,   but even without that they can be weakened considerably from their original state.On the drain side galvanized branch drains  (1.25 through 2" galvanized pipes)  can also rust out or clog up as the rust on the inside is very rough and catches hair, grease,  and other debris and will eventually need aggressive rootering,   which if the pipes have rusted enough may open up holes in them.I should note CAST IRON (hub and bell) old sewer pipe,  at least the 3" and 4" stuff seems to have a bit longer lifespan than galvanized steel;  it still rusts but doesn't crumble and flake and encourage blockages like steel does,   so an old house with a cast 4" sewer stack you may be fine for many decades more if you just replace all the branch lines going into it but leave the main stack.   

But you better have nerves of steel, a decent budget....and/or the ability to do a lot of the fixes yourself.....Good luck!

Are you running out of breaker slots or are you concerned with overall amperage?  

@William S. lots of large wholesalers and flippers hire assistants that are paid base + commission.Mostly cold calling work though, which is tedious.

Get steel reinforced deadbolts on all exterior doors4.

Most of my units are 1 / 1 apartments of similar configuration which has made it a lot easier to slot in new tenants with minimal gaps in the schedule.  

HiCurrently live in a 1958 home with an oil furnace from 1997 and original terra cotta tile lined flue, which I am told would be a good idea to have relined with a stainless steel liner because the tiles are no longer aligned.