After the adoption of the resolution ordering the making of the substitution and at such time as all the new property ordered to be acquired or to be acquired and improved shall have been acquired or acquired and improved by the city substantially in accordance with said resolution, the legislative body may thereupon adopt a resolution of implementation. At any time prior to the adoption of the resolution of implementation, the legislative body may abandon the substitution proceedings.

(Added by Stats. 1957, Ch. 1168.)