Food supply chains face challenges due to geophysical fragmentation and distribution issues, particularly in urban retail areas. This study proposes a network of nanostores (small, family-owned retailers) to improve access to fresh food in underserved communities. The case-study is applied to the Sabana Centro region of Colombia. Using a Multi-Product Competitive Facility Location Model and discrete choice model, we capture consumer preferences and retail performance factors. The study explores how consumer retail choices impact nanostore network design and product selection. Key results show that location and price are significant factors influencing consumer choice. The model selects stores on the city outskirts to avoid saturation. The research highlights the strategic role of small retailers in ensuring food accessibility and affordability in peripheral communities.