What is the process for obtaining a one-year extension of a NON-O visa in Thailand based on retirement?

I went to Chaengwattana yesterday to get one year extension by reason of retirement, on non O visa obtained in November, by converting SETV obtained in NYC. I had all forms ready. I arrived about 9 am, got bank letter (having ฿800K for 2 months) then queue number. I was helped after lunch about 2 pm. The lady who called me was just screening documents, then I received new queue number. They passed out 2 additional forms, one similar to application, the other reminding you of overstay consequences, and a blank sheet to draw map of address. I already had home visit, I hope they don’t do it again. Immigration officer saw me at 2:45 pm. All went smoothly, I had passport, TM6, apartment contract, landlord’s ID, bankbook, letter, and stamped copy of my US embassy letter they gave me last time. After the officer stamped my passport till 2020, a lady rechecked everything. I was concerned about TM30 but they didn’t ask for it. As well as stamps, they stapled a slip in my passport saying 90 day report is due in April. An older man was behind me, very worried. His papers were lacking some items. But he got his year also. I was going to do multiple re-entry permit but it was almost 3:30 (closing of queuing) and I was tired.