After being empty for years, Santa Barbara’s former Macy’s and Nordstrom buildings are set to get a new life that will reshape downtown. The City Council on Tuesday is set to formally approve an agreement to allow Yardi Systems to move its headquarters into the former Macy’s, and the former Nordstrom will be developed into an 80- to 112-unit housing project by Dune, Shopoff Realty Investments and Praelium (DSP). The city would also give up owner…