[Desdemona]

Mass can never be celebrated "in a temple or sacred place of any non-Christian religion."

I can't think of any better way to consecrate a place. Or are they saying the building has to be blessed somehow first?

The way I understand it is for a building to be considered a sacred place (in which to celebrate Mass regularly) it must be consecrated. Definitely to be a cathedral. It is possible to have a special occasion Mass in another place, but it cannot be a building of worship for any other faith.

[Cvengr]

Considering there are no more sacred buildings, because the Shekinah Glory now dwells in the believer so our bodies are now the temple of God, the effort to perform a ritualistic 'consecration' of a physical building is foolishness.

[P.O.E.]

I think you hit on it. "Celebrated regularly" might be the key phrase.

I was thinking of early days, that wherever good Christians would assemble, would be sufficient. Or perhaps of a dark future, where anywhere would be better than nowhere. And since truth should be eternal, I'd have thought the location would be immaterial.