Aberdein Considine is set to merge with Edinburgh law firm and solicitor estate agent Russel+Aitken Edinburgh.
The combined businesses - which will trade under the Aberdein Considine brand - will employ over 480 staff and have a turnover of more than £32m.
Russel+Aitken Edinburgh - which is separate firm from the firm's Falkirk/Alloa and Denny offices - is based in the West End of the capital and can trace its roots back to the 1800s.