James R. Lunnin Sr. did not reside at 21 Wareham St. in 1929 or 1930, but he may have owned or co-owned the business. Since he died in 1930 I would suggest that you look for his probate records, which should contain information about the business if he owned it. Another source might be Boston tax records for that time period. The US census 1920 & 1930 list him as a worker, not an owner; but those records are not always correct.
1929 Boston City directory:
1930 Boston City directory:
Dear Ms. Travis,
Thank you for posting your request on History Hub!
Information about the business and/or the building may be obtained from the Massachusetts Archives Division or from the City Archives of Boston, which has an online Guide to the Records in the City Archives that you might find useful. Information about requesting property tax records and ownership histories is located on the City's website as well.
Additionally, the City of Boston’s website about How to find historical permit records provides this permit from 1936 for 21 Wareham St. in Boston, which lists the building’s owner as “J. Brett,” and several other permits from 1940 that list the owner as the “St. Vincent de Paul Society.” No earlier permits are available online. Please contact the City to see if they can offer any additional assistance. They also provide online information about How to Research a Historic Building in Boston that may be helpful.
We suggest that you contact the Suffolk Registry of Deeds | Suffolk County MA Real Estate Records or search the Massachusetts Land Records website for potentially relevant information about the property or business.
Finally, the Boston Public Library has information online about Researching Your Home: The History of Your Home that may be useful. You may wish to contact them and the Massachusetts Historical Society for further assistance.
We hope this is helpful. Best of luck with your research!