March 19 (Reuters) - Gagasan Nadi Cergas Bhd GAGA.KL : * LETTER OF OFFER FROM LEMBAGA PERUMAHAN DAN HARTANAH SELANGOR * LETTER OF OFFER FOR EN-BLOC PURCHASE OF 523 UNITS IN PETALING DISTRICT * DEAL FOR 134.4 MILLION RGT Source text: ID:nKLSb5NdLD Further company coverage: GAGA.KL ((Reuters.Briefs@thomsonreuters.com;))