Only if the EC/OC has instructed the strata manager to invest the funds. Note that the types of investment are limited, refer section 73 of the Act.
73 Can money in administrative fund or sinking fund be invested?
(1) An owners corporation may invest any money in its administrative fund or sinking fund in any manner permitted by law for the investment of trust funds or in any prescribed investment.
(2) Any interest received on an investment made under this section forms part of the fund to which the investment belongs.