CREATE TABLE table_5746 ("Name" CLOB, "Street Address" CLOB, "Height feet / meters" CLOB, "Floors" FLOAT, "Year" FLOAT)

Name of 900 north michigan, and a Year smaller than 1989 involves what lowest floors?
SELECT MIN("Floors") FROM table_5746 WHERE "Name" = '900 north michigan' AND "Year" < '1989'
SELECT MIN("Floors") FROM "table_5746" WHERE "Name" = '900 north michigan' AND "Year" < '1989'