Prosecutors say it began in 1989 and continued until September 2008. Norristown police were tipped off when a tenant found one of the cameras.
Daley pleaded guilty in Montgomery County on Wednesday to more than 30 counts, including invasion of privacy.
The 46-year-old will be sentenced later. He faces 10 to 151 years in prison.
Defense attorney Tim Woodward says Daley never showed the videos to anyone else and "is extremely remorseful."
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