The research dilemma of this paper lies in the arguable differences on the directions of deconstruction theory in architecture. The primary inquiry of this study focuses on these differences in addition to identifying the contributions of deconstruction on architectural spaces. However difficult, the paper provides an attempt through a comparison between the architectural theories of modernism and deconstruction (represented by Mies Van Der Rohe and Frank Owen Gehry respectively), in terms of thoughts and works in relation to architectural spaces. The research methodology adopts a critical view by conducting a comparative analysis study for architectural spaces in modernism and deconstruction. Some of the important results of this study include asserting that architectural spaces are principally different in deconstruction compared to modernism in their boundaries, status, and the architectural character of buildings enclosing these spaces. The substantial change of the architectural spaces in deconstruction has come out through the variances of space boundaries, their architectural status internally and externally, and examining new shapes that are not bounded to familiar rules. This is in addition to stimulating the observer's view and attracting the attention while navigating the space wherein exquisite and natural views are utilized.