Assume that time(in months) is t

828000-2300x=690000

-2300x=69000-828000

-2300x=-138000

-x=-138000/2300

x=60

$690000 is what the building will value in 60 months or 5 years.

828000-2300x=690000

-2300x=69000-828000

-2300x=-138000

-x=-138000/2300

x=60

$690000 is what the building will value in 60 months or 5 years.