Respondent failed to pay OSE Design Group for mechanical and plumbing engineering services provided to Respondent for Healthy Solutions project, totaling $10,700 and Respondent failed to pay SML for structural engineering services provided to Respondent for the Stellar Airpark project, totaling $6,650 in violation of A.R.S. § 32-128(C)(5). Respondent firm engaged in the practice of a Board regulated profession without firm registration by engaging in architectural practice on the Healthy Solutions project and the Stellar Airpark project in violation of A.R.S. § 32-141 and A.R.S. § 32-121.