He left Somerset Park in 2004, briefly managing junior side Cumnock.
Upstairs, the development, called the Palace at Somerset Park, will provide 60,000 square feet of conference facilities.
Ayr United bought Somerset Park for £2,500 in 1920.
Ayr railway station is approximately 10 minutes walk from Somerset Park.
There is a small car park next to Somerset Park and nearby street parking is also available.
The current seating capacity of Somerset Park is 1,597.
Somerset Park first had floodlights installed in 1970, when supporters raised £12,201:14s:11d towards the £18,000 that was required.
They were drawn together in the Scottish Cup at Somerset Park.
The first phase of Somerset Park was created in 1994.
He also worked as the club's under 19s coach at Somerset Park.