Home features deemed "essential" include hot tubs, commercial-grade kitchen appliances and security cameras.

The main concern is that demand for tax credits could diminish once institutional investors calculate the full impact from the Tax Cuts and Jobs Act.

Legal and tax experts say the law bestows several benefits that make it more appealing for HNW investors to buy properties.

The reasons include healthy job and population growth, a thriving tech sector, and low vacancy rates despite a decent amount of new construction.

Most prominent of their shared interests is 666 Fifth Avenue, the heavily indebted Manhattan office tower that has been the subject of a global hunt for investors.

Here is an outlook on the sector for the upcoming year from several sector experts.