MCMILLEN, INC. is a design company based out of 155 E. 56TH STREET, NEW YORK, New York, United States. We are a full-service interior design firm. We have an interior architecture department. We have a fully-staffed business office, andshare the same business model for all clients. Our designers work together, exchanging ideas andhelping each other on the job. We can take a project from inception to completion.