What is the fine-grained topic of the following text: Ranging from single-family homes, condominiums and purpose-built rental, to ultra-luxury condominium residences and retail, Greybrook’s diversified real estate portfolio includes more than 50 developments expected to result in the development of over 32 million square feet of residential and commercial density, with an estimated completion value of $14 billion. Only return the topic.
Greybrook's real estate portfolio and developments