Such as, '100 meters west and 200 meters south of Edificio de los Correos'. This is difficult for those unfamiliar with the markers, especially if the marker doesn't exist anymore except in the memory of Ticos. These new signs will begin to be installed in December of this year, and homes and businesses will be assigned a number. This is to happen throughout all of the city districts. The project is being funded by Banco Nacional and Bank of Costa Rica.
I have personally come to love the current method of addresses/directions, but understand the significance to tourism especially of a numbered system. Until then however, and especially until Ticos begin to use and acknowledge the numbered system, make sure you ask several Ticos for directions, because another cultural nuiance -- their desire to not only reference a marker, but to give you directions even if they don't actually know. It's all about being nice, wanting to save face and not say they don't know, which could send you in the opposite direction. So, do your direction gathering by consensus. I suggest a best of 3. Full article La Nacion.
Barrio Bird offers walking tours of San Jose. If you are a visitor or have lived here for some time, there is always a new way to see the city. View tours or make a reservation by emailing firstname.lastname@example.org or calling 8926-9867