T o b i a s Mar 6, 2014:

"adjacent lot owners"
or
"owners of adjacent lots"

Stephen Kramer (asker) Mar 6, 2014:

The way it is used suggests it could change and what can change with time is the people owning the bordering land, not the borders themselves. So the term is refering to the bordering owners. What would be a collective name for them in English?

Maria Teresa Borges de Almeida Mar 6, 2014:

Confrontações neste contexto deve querer dizer limites do terreno...

T o b i a s Mar 6, 2014:

'current boundaries' Encountered umpteen times in previous posts.

Stephen Kramer (asker) Mar 6, 2014:

This is part of a "memorial descritivo" that describes the borders of a property, and this term refers to the owners of bordering properties.