Flat owners association

We are planning to register flat owner's association . There are more than 2 blocks each built 2 to 3 years apart. The builder collected funds for maintenance at the time of flat purchase. The first block ran out of funds as per the builder. Second block has funds and is planning to register flat owner's association.  The two blocks have separate account with the builder. Remember that the 2 blocks will have different levels of depreciation. Can they form one joint association and keep different financial statements and accounts?

.