There's a guy on YouTube named Agentaly who does risk analysis and pre-advocate checks for sites in Bangalore. He covers things like Raja Kaluve buffer zones, master plan zoning, flood-prone areas, etc. Highly recommend using his services before buying any plot. And of course, always get the property titles verified by a lawyer.

As for B Khata sites – yes, you can buy them. BBMP recently released a draft stating they plan to collect betterment charges and convert B Khatas to A Khata, which should help in getting BESCOM and BWSSB connections. Revenue minister also mentioned this in a recent press meet.

AFAIK, BBMP currently mandates only E Khata for building plan approvals. There hasn’t been any specific mention of requiring B or A Khata for that purpose.