A marketing firm based near downtown Dayton is expanding as it takes on a growing number of clients across the country. Lunne Marketing Group Inc. has invested about $100,000 to double the size of its office and expand to the third floor of the Firefly Building on Webster Street near downtown. LMG, a full-service marketing group, now takes up about 11,000 square feet on the third and fourth floors of the building and says the added space will help it comfortably continue to grow its national client...