Amarillo is an older model name. Either a frame or block construction. Usually between the 6’s and north. Poured walls off site (tilt wall usually onsite) was the new construction south of 44, fully completed then dropped into place with a crane. More than Twenty years ago our family did onsite poured walls, for larger homes, with an occasional on site tilt wall, instead of block.
OP hasn’t stated the wall construction, guessing block. I do wonder why the window wasn’t changed at the same time me as the lanai was added.
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Do not worry about things you can not change 
Last edited by asianthree; Yesterday at 10:03 AM.
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