Dear Tax Guru

I have lived in an urban, rent stabilized apartment my whole life. My apartment building was recently purchased and there is talk of a tenant buyout. First, would the buyout be a long-term capital gain or regular income? Second, if my current income is under $25,000 from Social Security (filing status, single) what would I owe in taxes and to whom (to pick a round number, let's say the buyout was for one million dollars)? And, finally, how would I minimize these taxes?

Thank you,
two22