My (day-job) company has several domains, let's call them company.com and companysupport.com and companyusa.com and so forth.
A different group manages the main site. I created a small page of frequently-used links for different categories of products which I host on a server in my group, and they included these lists in the main site via an iframe. Some products have more links than others, and some not at all, so the length of the page iframe varies. Because of this, some pages look fine, others have a small gap between the links and the rest of the page, and others have a big gap (about 150px).