Developers say gentrification is part of a neighborhood's evolution. Planners are concerned about the trends impact on an areas aesthetic, social and historical context.
"Mansionization has been occurring in the northeastern United States and California for years. Some planners decry the practice, saying building big, fancy homes next to more modest ones rips apart established neighborhoods aesthetically and socially and can destroy the area's historical context.
As the land prices rise, mansionization also can play havoc with neighborhood diversity, eliminating affordable housing for new home buyers, the elderly on fixed incomes and the working poor.
Developers say gentrification is the nature of neighborhood evolution. As houses outlive their life expectancies, they are replaced with new homes, increasing the land values in the neighborè hood, making everybody's land worth more."
Thanks to Abhijeet Chavan
FULL STORY: Gentrification or mansionization

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Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
Economic & Planning Systems, Inc.
UCLA Lewis Center for Regional Policy Studies
Mpact (formerly Rail~Volution)
Chaddick Institute at DePaul University
City of Piedmont, CA
Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research