What should I do with the fourth unit?

[John West]

Hey everyone. I'm looking to get some input for a property that I will be closing on in a couple weeks. 

The property has 3 actively rented one bedroom units. I have met with the current property manager and after interviewing her plan to keep her. She seems to be a real go-getter and really stays on top of the tenants. The place is going to cash flow very well partially because the seller is very motivated and we're getting a great deal.

Besides the 3 one bedroom apartments, there is a fourth unit that used to be a rinky dink grocery store back in the early 80s. Its pretty much a blank slate with 600 sq. ft. There is a commercial glass door in the front, but there are a few steps to get up to it. 

My question is this: What is going to be the best use of this space? I believe the break even point would be too far down the road to put in a fourth apartment. I'm leaning more toward putting a small laundromat in or putting in a few walls and doors and renting out storage space. Almost the entire street is apartment buildings. I was considering just door knocking and asking local folks if they would use the laundromat or if they already had access in their buildings. Any thoughts? Could we make money with a laundromat, or is it just a huge headache?