Commercial is hard to break into in large cities - high cost being a big barrier. Multifamily are one option, depending on the tenancy laws where you are.
I'd recommend looking at mini-storage properties. That was my path in, and it can be excellent.
The best thing about commercial real estate is that it is much more hard nosed that residential. What I mean is that a commercial property is mostly just worth a multiple of what you can make from it, and you can scale your price using that metric. There is no premium for a view or being close to a school for a warehouse.
That can make for some funny bargains. My first commercial property had 34 storage units, 8 one-room office units and 2x2 br apartments. I could not have bought a duplex for what I paid for the entire commercial property, and it came with 42 other paying units. Granted, it needed a lot of work (1.5 yrs of renovations) but the upside was enormous. Because it was commercial and I am in a smallish town there was very little competition for the property and I got it at a 12% cap rate. This is not normal, but it is something to look for because they do happen.
This is more along the lines of what I am talking about. So, mini-storage properties were your way in. Did you have any preexisting relationships with any realtors, brokers, or investors? Or did you DIY your entry? Did you find this property through a listing on something like LoopNet, or did you just know about it because smallish town? Did the whole thing need extensive renovations, or were there leasable units from day one?
At the time I was looking at all kinds of businesses, and there was a local realtor I was talking to about them. That said, I saw the sign on the property and brought it to him - asked him to get me some info.
I DIY'd my entry, took a line of credit against my home equity to buy the property. It needed extensive renovations - at purchase the town had put a 'do not occupy' sign on it because the previous owner was a moron and wouldn't let them inspect it. Before purchase I lined up the town to agree to lift the order, give me a permit for the renos, and got the bank on board with giving me a lower down payment requirement to close the deal. They had been on the brink of having to foreclose on the property, so they saw me as an opportunity to save their investment. It was a risk, but I was confident I could do the work.
There were rental units full from day one, and it was paying its mortgage and utilities from day one as well. I did a rolling reno where I upgraded units as people moved their stuff out, while doing all the other stuff as well. For the last few I moved people around so I could get the units complete. The two apartments were occupied the whole time, though I did do some upgrades as I went along - and will do more if the tenants ever move out.
If I do it again, which I am considering, I'll probably just go with straight storage. Easy tenant management, minimal maintenance.