@Nicole Rogers
Hey Nicole, just a couple things to keep in mind, based off the above comments:
1) Most syndications require you to be an accredited investor in order to legally take part in the syndication. In order to be an accredited investor, I believe you have to earn $200,000/year (or more) or have a net worth of over $1,000,000. If it's a family member, friend, or someone you know from a previous encounter, it's possible they don't have to require investors to be accredited.
2) As far as the 4plex goes, I saw someone mention you needing to put down 25% for down payment, thus your $25k being put towards a $100k 4plex. This isn't entirely true, as you could house-hack it, making you only have to put down 3.5% via an FHA loan (though you'd have to plan to live in one unit for at least a year). With a 96.5% loan to value, you could buy a property in a very nice or competitive market, provided your metrics working out for you.
Hopefully this helped in some capacity!
Best regards in your wealth-building journey,
Eric