How can a same-sex partner also get an EB-5 visa?

I am pretty sure that your partner will not be allowed to accompany you if you obtain an EB-5 green card, unless you are legally married. Can you both go to another country to get married?

You can get married in a jurisdiction that allows same-sex marriages legally. Then you can include your spouse in your I-526 petition as a derivative beneficiary and your spouse can then immigrate to the United States with you.

Currently, you must be lawfully married in your country to include a same-sex spouse in an immigration process.

You can get married in a place that allows same-sex marriage and use that marriage license even if your country does not allow it.

There is no prohibition that I know of on the U.S. side. However, you will probably need to go a jurisdiction where you can legally marry and obtain the marriage certificate.

In order to include your partner in your EB-5 application, you would have to legally get married in a jurisdiction that permits marriage between people of the same sex. You could get married in the United States or any other country where this is permitted (e.g. Canada, Spain, etc.). Same-sex marriages are now given the same rights as marriages between people of the opposite sex in the United States. Please note that civil unions or similar partnerships are not considered marriage in the United States, so immigration benefits are not given to these unions.

You will need to be married for your partner to accompany you. I advise you to travel to a country that permits same-sex marriage and legalize the arrangements.

Get married; a spouse gets full benefits.