Greater Anchorage Area Borough v. Sisters of Charity and Barnes Hospital v. Collector of Revenue

Review Greater Anchorage Area Borough v. Sisters of Charity and Barnes Hospital v. Collector of Revenue. Answer the following in a well-organized, two to three-page essay. 
How did to courts take such similar cases and reach opposite conclusions? 
Which of the two interpretations do you find more persuasive? 
What about leasing hospital space to vendors such as a McDonald’s Restaurant? How might that affect tax exemption?