LMN Corporation is evaluating the lease versus buy decision for a new office building. The company has the option to lease the building for $50,000 per year for the next 10 years or purchase the building for $400,000. Using the net present value (NPV) method, compare the financial implications of leasing versus buying the building and advise LMN Corporation's management on the most cost-effective option. In your analysis, consider factors such as cash flow projections, tax implications, financing costs, and the opportunity cost of capital, and discuss the strategic implications of the decision on the company's long-term growth and profitability.