I have no idea about the market value of land in Delhi 65 years ago. Do you?
I’m presuming the government back then was democratically elected and Hindus make up about 80% of the population. Why do you think the government back then was anti-Hindu and why was the sale of land to Baha’is anti-Hindu?
It's anti-Hindu because Hindus go away out of their way to appease minorities. In most social democracies, and India is no exception, minority rights are protected. It is to protect against the atrocities of genocide, amongst other forms of discrimination that have happened in far too many other places. So it's a really good thing in one sense, but in another, it harms the majority.
Can you imagine a minority, like the LGBQ, for example, not just getting equal rights under the law, but also special privileges that straight people don't get? So an analogy would be that it's not just the government allowing gay marriage, but also paying for it to the tune of a $10 000 grant per marriage.
This favoritism of minoritiy faiths in India has been going on a long time, and is substantial. Muslims can get grants to go to Mecca, Hindus can't get any grants for cheaper pilgrimages within India, Hindu temple incomes are taxed while other faiths go tax free. Imagine all donations going to the Delhi Bahai center being subjected to government tax at a high rate, for the government to use in any way they choose.