Trinity has paid an initial consideration of £0.9m, but will pay up to a further £5m if Globespan meets specified operating profit targets over the next 30 months.
Globespan is expected to generate revenues of at least £4m during its first year of ownership by Trinity Mirror.
Globespan, which also owns and the What House Awards, will be integrated with Trinity Mirror's online property business Smart Media Services.
Homes Overseas magazine has been published since 1965 and its features links to various property research websites worldwide, as well as different mortgage websites for users to search.
and the What House Awards are business-to-business brands.
Sly Bailey, chief executive of Trinity Mirror, said: "Globespan is a great addition to our online presence. The Homes Overseas and What House brands perfectly complement our existing portfolio of successful online property businesses that include and .
"This acquisition demonstrates how Trinity Mirror continues to segment and layer its markets by both geography and market sector.
"Globespan strengthens our regional network of over 80 local property sites and enables us to achieve faster growth of market share in the online property sector."
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