Seeking legal advice regarding sale of a plot of land Eletronic city, Bangalore

I have a 30x 50 ( 15000 sq.feet plot in Bangalore , Electronic city area,(Post office). it is beside the Maadiwalla to Hosur High way ( over bridge) near pillar No 183. oposite to Prestige Alpha. (Bommanahalli). 100 metres away from upcoming Metro Railway. It is in 0wnership for the 28 years. Tax paid upto March 2019. I am trying to sell it. It seems there is some problem. There are a few more plots there in this same manner. I have built compound wall with gate and a small asbestos shed. Next day the gate was removed or stolen from the site. May be by some local nearby residents. I am living in Kochi. some people on various occasions came there with interest to buy but then backed off. There are residents opposite to our plots, 4 metres wide road in between. is it due to some legal problem?.greenbelt or indusrial area or Sc/ST area? How can I move forward? What should I do now.? what could be the reasons? Your advice will be appreciated. Regards, Jacob. Tel [deleted]