Microsoft Corp. wants an extra year to complete the $418 million first phase of a regional data center in West Des Moines because it is busy with other construction projects, according to a report to the Iowa Economic Development Authority board. In July, the IEDA board approved $4.7 million in tax credit benefits that were tied to a completion date in July 2019. The board will be asked Friday to push that date back to July 2020. The city of West Des Moines plans to complete the connection of Veterans Parkway west to 105th Street to accommodate a 2019 opening of the first phase. Building the highway and making other infrastructure improvements is expected to open 5,000 acres to additional development. Called Project Osmium, the total data center development is expected to cost $1.5 billion to $2 billion and occupy 1.7 million square feet of building space. Read more about Project Osmium. Microsoft continues work on its $1.1 billion Project Alluvion data center near Veterans Parkway and Iowa Highway 5 in West Des Moines and continues to work on its Project Mountain data center on South 88th Street, also in West Des Moines.