俺知道有关unrelated people居住的人数限制，但这个人数限制房东也是可以用来约束一家人口的数量，

只要不是歧视。
看加州的规定：
The landlord may ask you about the number of people who will be living in the rental unit. In order to prevent overcrowding of rental units, California has adopted the Uniform Housing Code's occupancy requirements,25 and the basic legal standard is set out in footnote 25. However, the practical rule is this: A landlord can establish reasonable standards for the number of people per square feet in a rental unit, but the landlord cannot use overcrowding as a pretext for refusing to rent to tenants with children if the landlord would rent to the same number of adults.26

www.dca.ca.gov/publications/landlordbook/looking.shtml

所有跟帖： 

• 房东问的是有没有“规定”，不是问可不可以自己限制 -柠檬椰子汁- ♂ (0 bytes) () 08/06/2015 postreply 11:48:39

• 俺已经脱离了房东的直接问题，只是在陈述另外一个事实， -水中捞月- ♂ (107 bytes) () 08/06/2015 postreply 11:54:03

• 2000 SF 是很大的房子了，不租有歧视家庭状态的嫌疑。 -柠檬椰子汁- ♂ (1186 bytes) () 08/06/2015 postreply 11:59:11

• 觉得你没读懂楼主的言外之意。楼主说别人应租至少2000s.f的房子，言下之意就是她的房子没这么大， -水中捞月- ♂ (106 bytes) () 08/06/2015 postreply 12:05:53

• 只有我们这样的闲汉，从人家一句话的问题里面琢磨出那么多废话 -柠檬椰子汁- ♂ (0 bytes) () 08/06/2015 postreply 12:11:09

• 笑死了 -狂爱蝴蝶酥- ♀ (0 bytes) () 08/06/2015 postreply 12:34:49

• S -NLandlord- ♀ (0 bytes) () 08/06/2015 postreply 13:31:59