You’ll find these have identical layouts, making it very easy to renovate, easy for maintenance, and the basement can become storage and laundry for extra income.

Lower maintenance costs than apartments.

@Josh Caldwell, It's commonly called a consolidation exchange. 

IE take out every thing down to the studs.. ( not common but has happened..)

Think of all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

It moves and breaks and is a really common problem to have to fix. 

Some common reasons: Basements: ground is sloping toward the building, no gutters, poor soil, high water table, leaking pipes below the foundation or near the foundation.

It is a common wholesaling strategy.

I'd assume that is common knowledge.

What will it cost for cap ex, management (when you grow and want this), regular maintenance, taxes and insurance (if not in mortgage) vacancy allowance, eviction costs, turn around costs to make the units rerentable.