Building owner asking us to evict

I am a lady having 2 small childrens and a patient husband. I am running a ladies hostel in Chennai. I have been running the hostel in the same building for the last 18 years. I got hostel registration and other registration formalities for the address. In the initial period of my hostel business I suffered a lot to bring the hostel to break even. Even in lock down I paid the rents. The owner is very strict. I paid for the borewell motor, pipes. Whatever the maintenance if it is electricity or damage of door due to termite, I only paid the charges. The owner not even share the amount. We entered in to a unregistered rent agreement for 11 months. That has been renewed properly till date. The owner increase 5 to 10% rent every two year and I always agree and sign the agreement. Last year Chennai metro has revised the tax from 2014 (I think) that has become a huge amount (around 1.7 lakhs) and the owner refused to pay amount. 4 to 5 Corporation staff often come to our hostel and shouted at our staff for not paying the tax. Finally I only paid the amount. During Chennai Flood the water came inside to our hostel and damaged both the water moters and our properties. My owner not ready to repair the motor, I only repaired the motors and fixed that problem. After the lockdown sufferings, by my hardwork and dedication I brought this hostel to make profit. That time my owner asked me to give the running hostel to his daughter in law. I quoted a amount. But he refused and he wants the running hostel only for a Meagher amount. I refused to give it and I said I will continue as a tenant. But from that time he is asking us to vocate. Torchering by phone and in person to vocate the premises. I have invested heavily, made several advertisement to bring more people to the hostel. To get my fruits I need atleast 5 to 7 years. But the owner denies. I am asking you can I drag this eviction process for atleast 5 to 7 years. What is the legal formalities I have to start from my side. I paid the rent properly for the last 18 years. Even though the house owner increases 10% percentage every two year now the owner feels that he will get more rent if I vocate and give it some other tenant.