@Costin I.
If by partnership you mean a legal partnership (LLC or LP or otherwise), then that legal entity would need to either dissolve (or deed out your 50% to you) prior to sale before you could sell your own 50%.
In order to do any 1031 exchange, the same tax filer has to complete both legs of the exchange. This means that if a multi-member LLC is on title to a property and sells that property, only that same LLC can engage in a 1031 exchange.
If you and your partner want to maintain flexibility, you should set up your ownership as two Tenant In Common owners with an undivided 50% ownership each in the properties. Each of you will report 50% of the property on your individual tax returns. (Alternatively, you could set up a single member LLC to own your 50% of the properties). Under this structure, you could sell and 1031 exchange your 50% without implicating your partner at all -- they could exchange with you, exchange without you, or cash out.
If you were both two members in an LLC, which is very common, and you wanted to go separate ways, which is also common, then you would probably want to go through a "drop and swap" process. This looks like:
- dissolve your LLC
- file a final tax return for the LLC
- distribute out the LLC's assets pro rata to each member (this is a tax-free distribution)
- each member takes title to an undivided interest in the properties in a TIC structure
- then you can sell
We deal with this sort of thing literally every single day of the year. Frankly, there are plenty of other small details that matter here. There are also a few other possible strategies to deal with it. I'll send you a connection request and you can message me directly as you think through this.