As it turns out, we were in Liberia so we went to the province office on the 3rd floor of the shopping plaza to see what they had to say. You recall that the Tilaran muni told us to go there to register. Well, we should all be reassessed if we want to cover our back sides. We were told that our assessment should be valid because it is less than 3 years old, however, we suspect it's a little low but it's more than 50.000.000 colones. There is a website where the brave (who can also read Spanish fluently) can complete their own reevaluation at
www.hacienda.go.cr.
There are also nice people in the Liberia office who will get onto the website with you and walk you through the process.
A couple of days ago, I heard from a friend who is using an engineer from Arenal to complete the reassessment for a quiet reasonable fee. From what I understand, this person will not file the assessment but make it ready for an accountant to file.
We've decided to sit down at the computer with a bilingual Tico and see if the website is doable. If not, we'll call the engineer. The name I was given was Alvaro Jose Murillo Alvarez at 2694-4925 or 8850-3870 or 8378-9046.
That's where we are at the moment. Hope it helps others.