See my recent comments on corruption in Argentina in a recent thread, which has a few comments about this particular subject.
Be prepared to either 1) pay bribes or 2) go out of business. That is the biggest thing that owners of bars and clubs have right now, is staying open. The biggest concentration of issues seems to be related to occupancy / fire inspections, although there are a myriad of other issues involved in this as well.
And that is if you can even find a place to rent that will take you as a renter. The minimum business lease here is three years and you have to have other property that you own (or someone you know owns) to secure the lease, as a garantia (it's not a law, but nearly all property owners require a garantia). Unless you are talking about renting a property in a bad part of town, that would probably be run-down and possibly dangerous for clientele (and yourselves), I doubt you'll find a property owner that will be willing to rent to a foreigner (or anyone else, for that matter) unless you can come up with a garantia.
I'm not saying it's impossible - I know three guys who have been quite successful at opening a very popular bar with two locations. But it is not for the faint of heart and someone with a little bit of money, and you will go through travail after travail, most likely, in getting the place up and running and keeping it so over time.
As Bajo_Cero mentioned in that other thread, there are a lot of bars here who launder money and the police and all manner of officials are looking to cash in on such money-makers. Even if you're running an honest business (as do the guys I know, as far as they are able, and certainly started off that way completely), you will be a target.
Your experience from 2008 will not necessarily bring much to the table these days either. Things have changed significantly since then economically and including things like imports. However, the one business that does seem to continuously generate money is the sale of alcohol - i.e., clubs intended to allow the young ones of the city to souse themselves at will, in great numbers.
Also, to make a truly authentic Irish pub here, you have to think about the availability of things that you want to include in your establishment and the products you would offer and how you will get them here.
Then, you have to start thinking about labor issues. High taxes, awful labor laws that completely favor the worker, 13 months' salary per year required (among many other bad labor laws) and give the employer very little real ability to fire people that don't work (for example) - unless you want to have people who work for you for less than three months and you let them go before they hit that three month limit (that's when you can let someone go, during their "probationary" period, if you don't like the way they do their job, before you become encumbered with a bunch of crap). You will have a hard time finding someone like a manager that you can trust to run the place, so you will have to be there pretty much all the time or worry about pilfering or down right stealing, lack of service and caring about the place, etc.
Not an easy task. Don't want to discourage you, but you have to know the truth of how things are here.
