Ik kom een heleboel mogelijke definities tegen via Google definities (zie link hieronder). Zou het zo kunnen zijn dat AMB investeert in de ontwikkeling van gebieden in steden waar al gebouwen staan/waar gebouwen stonden?

In the urban planning and development industries, infill is the use of land within a built-up area for further construction, especially as part of a community redevelopment or growth management program or as part of smart growth. It focuses on the reuse and repositioning of obsolete or underutilized buildings and sites. This type of development is essential to renewing blighted neighborhoods and knitting them back together with more prosperous communities.[2] Redevelopment is development that occurs on previously developed land. Infill buildings are constructed on vacant or underutilized property or between existing buildings.
(...)
Suburban infill describes the development of land in existing suburban areas that was left vacant during the development of the suburb. It is one of the tenets of the New Urbanism and smart growth trends of urging densification to reduce the need for automobiles, encourage walking, and ultimately save energy. One exception to this is the practice of urban agriculture, in which land in the urban or suburban area is retained to grow food for local consumption.
(...)
Infill housing is the insertion of additional housing units into an already approved subdivision or neighborhood. These can be provided as additional units built on the same lot, by dividing existing homes into multiple units, or by creating new residential lots by further subdivision or lot line adjustments. Units may also be built on vacant lots.