Pick a fun gender neutral color. 

The mechanics of the deal are not too complicated, although as others have noted you can't advertise the property and then exclude people based on protected class including gender and family status....at least not legally. 

Room occupancy goes by ages and gender, a square footage minimum for each occupant of a bedroom, if it's big enough, you could have 3 brothers or sisters at certain ages.

So when it came time for the child to sell the property there would be a larger and in some cases a much larger tax bill.In addition Life Estate properties are sold essentially at a discount that is figured out by actuary tables based on the sellers age and gender.

HUD dictates occupancy in housing and has guidelines as to size of rooms required for a bedroom, as I recall it's 70/80 sq ft at least 7' wide (allowing a bed) and ceiling averaging 7' or more in that calculation (like attic spaces).There are gender and age requirements, where small girls and boys can double up but older kids must have their own room or be with the same gender.

However at 98 years old she was still living in that house when we bought it.There are actuary tables, life life insurance tables, that value life estates determined by the current age and gender of the life estate tenant.We thought that due to the tenants age that it was a calculated risk.

.§2-2 The Property Manager shall not deny service to any person due to race, color, religion, sex, handicap, familial status, national origin, sexual orientation, or gender identity.Article 3: RESPONSIBILITY TO CLIENTWhen working in a disclosed relationship with a client, the Property Manager shall protect the client’s best interest at all times.STANDARDS OF PROFESSIONALISM§3-1 The Property Manager shall use written agreements, and written extensions, if required, outlining all responsibilities and fees, if any.

Even with single gender residences you can get issues.

He's currently working on the design & testing of a robotic chopper pilot but that's still 'undercover'.Then we went to a gender reveal that was filmed by a drone above us & everyone got a copy of the video BUT not exactly appreciated if you're balding.

Although that is a gender stereotype, it seems to be true!