I recently went to mexico for vacation and my sister in law told me that they were constructing a new kh.
I questioned her on how was it done, and this is what she told me:
They saved the money for long time, then they sent the money to the WT.
WT then bought the land and the materials (but everyting is under WT name)
All brothers and sisters will work for free.
After everything is completed they still have to pay a "suggested contribution" to the WT for the use of the KH.
I think the law in mexico recently changed and now the WT can own property that is why they are pretty active building KH's.
She was a little bit upset because she said that WT spent more money on the KH's for rich areas and for them it was going to be a modest KH.
When I was living there, WT never built any Halls even thought they were allowed, the only thing was that it would be "federal property".
I just wanted to share this with you guys.