T. Ramakrishnan CHENNAI: Land, measuring 323.7 acres all over the State and valued at nearly Rs. 305 crore, belonging to the Tamil Nadu Housing Board (TNHB), are under encroachment, according to an audit report on the annual accounts of the Board for 2007-2008. More than 50 per cent of it (175.48 acres) lies in the division of K.K. Nagar, Chennai. This is valued at Rs. 3.6 crore. (In the TNHB