Keep in mind, that in order to climb the flight of stairs, it takes one step at a time to reach to the top.

Negotiated contractor price from $24,000 for finishing entire basement and adding bathroom to $18,000. stair and lighting additions the cost was $20,400.

Quote from @Donny Dormady: If possible, I would stick with a nice cement floor.

every flip is different, you learn something new every flip you do, this particular one was setup for 2 families but i opened between the stairs to adjoin the other half of the house Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

every flip is different, you learn something new every flip you do, this particular one was setup for 2 families but i opened between the stairs to adjoin the other half of the house Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

Lead PaintLead PipesAsbestosSurprise Asbestos (in places you never thought they would not put it, such as beneath the basketball court wooden floor).ADA (and how many stair steps is it up to the office)County GrantsCity GrantsState GrantsFederal GrantsProperty Tax abatementsExtra unneeded land disposal or conversion (will they re-zone to allow you to build a Liquor Store, pawn shop, buy here pay here appliances, or buy here pay here rims store), or must it be playground and teachers parking forever.) 

Also they did not show me the carpet in the hallway and on the stairs.

Just bought a property in Gainesville Georgia, 1900 duplex which has two entrances, two stairs and everything double except for the kitchen which is only on one side, it was rented as a single family but I bought it with the intention of building the kitchen on the side that doesn’t have one and rent both apartments.The common wall has doors that communicate which each side of the duplex but I was talking to a friend that told me that I need to build a firewall on that wall because of the code.

Cement-based Hardie Plank or cellular PVC won't rot or be attacked by the bugs.

@Jake Baron sounds like an expensive property to rehab because as others have mentioned due to the water intrusion you will likely encounter rot whenever you open a wall, repair a porch, stairs, roof etc.