This house, located at 4714 Baltimore Ave, Hyattsville, Maryland is where Lloyd Lee Welch, Jr. was living with his mother in March 1975. It is the address that he gave to Montgomery County Police on 1 April 1975 when he voluntarily appeared and claimed to have information about the abduction of the Lyon sisters - in hopes of claiming a reward announced in that morning's newspapers.
The Montgomery County Police took Welch's statement and information in April 1975 but dismissed him as an unreliable person or as providing useless information. Welch was claiming that he saw someone who looked like the Tape Recorder Man (TRM) sketch which had just been published in the same newspapers. There were many other witnesses coming forward at that same time claiming to have seen TRM at various places.
However, it was that report, reviewed many years later by cold case detectives, which brought Welch to their attention. They located him in a Delaware prison where he was serving time for unrelated crimes. He was initially considered a potential witness, and later as a person of interest/suspect in the case.
Over the course of time and several interview sessions, Welch told many varying stories about the Lyon sisters and persons he claimed were involved. During that time, investigators attempted to verify and cross check Welch's ever-changing stories. They located his mother, who was still living, and she related that Welch and his girlfriend were with her in her house on Baltimore Ave, Hyattsville when they learned of TRM and of the reward, and how Welch had remarked that he was going to try to claim the reward.
The two residential houses seen in the photo are (and were in 1975) in the midst of a commercial/industrial area.
If Welch's story of imprisoning one or both of the girls in a basement is true, this would probably have been the place. It was searched in 2014 by investigators looking for evidence, and they focused on a basement area accessible by an outside door.
Perhaps the yard should be carefully searched with in-ground sonar as well.
LINK:
Timeline of Lloyd Lee Welch, Jr.'s known whereabouts:
