Cottesloe MLA Colin Barnett opened the school's new purpose-built buildings in Mosman Park earlier this month.
Mr Barnett said he was delighted to open the new junior primary classrooms and administration buildings.
"Beehive Montessori School has started on a phase of growth and development and all the junior primary school buildings have been purposely built to support the school's teaching principles," he said.
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He presented the school with a jarrah and karri wooden flag-stand that was handmade by the Mosman Park Community Men's Shed, as well as a state and national flag.
"I hope the students, teachers and parents enjoy this flag stand, which is a wonderful example of the excellent craftsmanship that takes place at the Mosman Park Men's Shed," Mr Barnett said.
The second stage of redevelopment includes a new administration building, four junior primary classrooms, a new junior primary playground and car park.
Stage one, which included a new school hall, library and a central square, was finished in 2010.
The redevelopment was partly funded through a low-interest loan of $1.08 million from the Department of Education Services.