ANSI is defunct (I believe.) Any of the old standards sill in use have been adopted by other professional associations.
For example, ANSI Y14.100 (replaced MIL-STD-100) and is now
ASME Y14.100 having been updated as late as 2004 …
The ASME adopted most of the old Y14 series of standards from ANSI. So you’ll have better luck searching using "ASME Y14.{number}" than "ANSI Y14.{number}".
You might find free PDF editions available through collegiate online libraries. For example here is one …
https://www.noao.edu/ets/Mechanical/Policies/ANSI%20Y14.24M-1989.pdf
For Architectural try …
https://www.nationalcadstandard.org/
https://www.iso.org/ics/01.100.30/x/
… and another starting point …