However, Ruth Davison, chief executive of ISHA said: "We are pursuing every possible avenue so we do not have to pass costs on to leaseholders.
"We believe that builders should pay, but [Belvedere Court] is past the point we can make a claim against them."
She said it is "pushing hard" for the government to commit more money to protect not-for-profit businesses such as ISHA and leaseholders who bought homes with all "regulatory sign-offs in place".
The small housing association has six buildings over 18m and more than 30 between 11m and 18m, which means the cost of carrying out safety work will be significant.