Even if you were to use an electronic lock (w/ backup key) at your external common entry, you can still use a master key for the building and have tenants keys work in common doors as required (entrance, laundry room, etc) without the need for multiple keys.    

My husband and I are considering using our separate entrance basement space as an Airbnb rental.

Seeking out an attractive investment opportunity in NYC is extremely hard and huge entrance barrier for someone who doesn't have too much money.

if i were to wholesale, these are my different options to get the property under contract.Cash deal- big discount on priceOwner Financing- they need finance the equity and i pay off whatever mortgage they have left. ...

I’m looking for feedback on a tried and tested method to undertake in my entrance strategy into the market.

There won't be any grand entrance with 30 ft high windows or anything like that but I will have reception and lobby areas like a small real estate office would have.

Like its own townhouse, it's private and each unit has its own entrance and 2 spots for parking and location where you can walk if you want to get a container of milk. 

They need to work on both the entrance and exit of the investment.

At times, the odor was so strong you can smell it walking in the main entrance into the lobby.There's been some discussions here on remediating it with chemicals.

If the neighborhood is sketchy you could put those metal mesh security doors on at least the rear...females might like them at both entrances so you can open the door but be locked in.