Expenses are usually listed in Pesos. Sales prices are almost always in USD (at least what I've seen where I have lived), unless you are talking about new builds, for example, where they are trying to get you to buy into the building with an apartment (which are usually great deals money-wise, one simply has to hope they finish the project as promised, which I think the majority of them do) and these nowadays are often offered in pesos only.
Note to the OP - expenses, as an owner, can vary widely in the same place. Any time anything out of the ordinary has to be done to the building (for example, elevator maintenance is one thing and planned for, but if the elevator craps out and a new one is needed, the owners pay that under extraordinary terms), the owners are charged the extraordinary cost, distributed among themselves usually according to the square meters of each apartment (to apportion the costs fairly). Renters are more lucky in that they are not supposed to pay "extraordinary" expenses. The national contract states that, and as I understand, any individual contract is free to say whatever it wants, but whatever portion of the contract signed that conflicts with the national contract is null and void and is supposedly unenforceable. I.e., a tenant should never have to pay extraordinary expenses, unless there has been a change in the new laws they made recently related to rentals (but I don't think so).
1500 pesos a month for expenses is pretty damned good, at least compared to where I've been living the last 6-7 years or so. Last time I paid around that amount, the peso was still 3-1 to the dollar. But admittedly I live in relatively high-priced areas and have a big apartment (for 5 of us plus my office). One of the reasons I left the suburbs of Garin/Tortuguitas (closed neighborhood) was because I was paying 1300 pesos a month for expenses when the exchange rate was 3-1! I started out at 600 pesos, which was much more reasonable, but had more than doubled in less than two years. Every couple of months the expenses rose and rose and we're not even talking about extraordinary expenses! Total expenses in that neighborhood was around 2200 with the extraordinary thrown in when I left 5+ years ago.
My current expenses are around $5K pesos with a 170 sm apartment. Less, with the blue rate, than I was paying 5 years ago in the suburbs, but nowhere near 1500 pesos
