In its continuing effort to upgrade the stores in its system, Tops Markets LLC has completed $2.45 million in renovations for supermarkets it operates in South Buffalo and another in Warsaw in Wyoming County. Amherst-based Tops, the region's largest supermarket chain, invested $1.25 million to renovate its store at 1460 South Park Ave. The South Park project is one of several for Tops in Buffalo, where the chain has invested more than $5 million in recent months renovating several of its city stores.