Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.
They should have made a deal with the bank to agree on a price to pay them in installments. That is how they bought some masjids in Toronto.
Anyhow, now that they have bought it on the terms, they agreed they ought to pay it off as soon as possible.
There is no point to worry or complain about it now.
So, I would urge you to be part of the Mosque and help them to clear the mortgage as soon as possible.
Almighty Allah knows best.
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