I have recently bought an apartment which had mentioned in the sale deed that I own 615 sft of UDS for a built up area of 1538 sft. However for other owners, the UDS was much bigger although they had smaller dimension flats ex: 1465 sft apt had 887 sft UDS. Is this legal? Is there a way I can demand for more UDS now from the builder (it's almost a year since registration has happened). Please advise.