Joseph Mastri, aka Captain Joe and the House Doctor, passed away on October 7, 2021, at Bethesda Memorial Hospital in Boynton Beach, FL, at the age of 93.  Born and raised in Yorktown Heights, NY, he was the son of Manuel Mastri and Carmella Maretta Mastri.  He married Nancy (Ann Elizabeth) Neuman, who predeceased him.    Joe was a successful land developer and builder, founding Jardem Builders, Inc.  He moved his family and business to Rhinebeck, NY, where the business continued until his retirement and subsequent move to Boynton Beach, FL.  Joe was a boater and spent his summers at the Poughkeepsie Yacht Club on his beloved boat-Happy Days II until he reached the age of 90.  He was a member of the group – Yorktown from the 40's and 50's and was proud to be one of the last old timers in that group.  Surviving are his son and daughter-in-law, David and Adrienne Mastri, brother and sister-in-law, Roger and Patricia Mastri, grandchildren, Tyler, Madison, and Stephanie Mastri, and nephews, Brian and Doug.  In addition to his wife, Nancy, he was predeceased by his parents, Manuel and Carmella Mastri, brother, Francis Mastri, and his adopted son, Richard Mastri.  There are no calling hours. Cremation took place in Florida, and burial will be private and at the convenience of the family.  Joseph's family respectfully requests memorial donations to the Leukemia and Lymphoma Society, PO Box 22324, NY, NY 10087 or online at https://www.lls.org/ways-to-give .   Cards and notes of sympathy may be sent in care of Joseph Mastri to Sweet's Funeral Home, Inc., 4365 Albany Post Rd., Hyde Park, NY 12538.    To send an online condolence, please visit Joe's obituary page at www.sweetsfuneralhome.com .