Evolve my current logo for a re-brand

Description

I wish to re-brand my consultancy business. The logo I have now is fine - it does the job - but I'd like to create something that is more descriptive of what I do, and is more up to date. Timeless styles are preferred - I do not wish to be re-branding every 2-3 years.
The principle of my business is quite simple: I am a planning consultant and architectural designer. I create value for my customers by unlocking the underlying value in their land and real estate.
I will need further help later on to create a suite of letterheads etc.