Isn't rent for one of those stores going to be ca.$20k per month, minimum?
So you need to figure out how you get annual income of $240k/year just to pay the rent - after all other expenses like insurance, city taxes (if applicable), heat and power, and any staff.
Where I used to live, we had a hackspace in a dirty industrial area of town. The rent on that was still £2,000 per month, for 2500 sqft. You need 100 active members at £25 a month just to cover costs, and that's with directors putting in 10-20 hours a week of free time. Not to mention major headaches like health and safety for members - liability insurance for hackspaces is still very difficult to get, and rather expensive and has restrictions on what members can do (for instance, you're not even allowed near a cordless drill unless you've had a proper induction with trained members and it's all been signed off. The circular saw requires a training course...)
I applaud you for considering it but work out whether there are 1,000 other people in your town that are just as interested and willing to put say $30 per month towards it. If so, then it's probably a viable model, but, until then...