sir, i rented my flat 2bhk 700 sq ft brand new flat in tamilnadu for 10k about 2 years back ...it was in a huge community and the builder was not ready with any of the external amenities yet at that time but they had already charged maintenance (2k /month)for a year in advance as part of the flat handover fee.. trying to be reasonable from my side, i didnt pass this burden to my tenant and collected only the rent of 10k for two years.this was agreed at the time of tenant move in as well - which is 1. rent will remain same for 2 years and no maintenance fee will be assessed for 2 years. the builder is stil l only half complete with the amenities even now (very slow progression and dealing with him on this is a altogether different ongoing legal issue), and i am trying to revise the rent to 12K plus applicable maintenance during the next rental agreement renewal..is this legal to do. we are talking about a rent increase of 4k /month here with maintenance..can the tenant deny this revision and use this as a reason to file a case and overstay...kindly advise..we usually do mostly email conversations with the tenant ..is it advisable to put this rent revision in an email..