Evening Regency: Do you mean 3x pre or post tax profits?
For comparison, assuming the business is established and is not owner managed (which you have stated it is!), IMO a reasonable valuation would be 5-6 times
post tax profit. Payments for the business should be in milestones adjusted against actual return, perhaps half at handover and then the remainder at 9 months then 12 months.
The above can be adjusted upwards to as much as 8x post tax profits for a larger, well run business with ISO/established management team/quality client base/opportunity for growth/no debt/etc.
Conversely the business could also be worth less. The old cliche "it's only worth what someone will pay"

Go for it then develop and expand the business!