Based on the information given the down payment you will need to pay is $250,000.
Using this formula
Down payment=Building cost -Mortgages
Where:
Building Cost = $550,000
Mortgages = $300,000
Let plug in the formula
Down payment=$500,000-$300,000
Down payment=$250,000
Inconclusion the down payment you will need to pay is $250,000.
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