Was it in full direct sun in its former life or in the shade?

Light coming through glass is filtered even if the glass is clear, so if got significant outdoor sunlight befdore you got it, overwatering seems more likely than sunburn.

So, how do you water? Does the pot have a drain hole?

The brown patches look just like the photos in the other FLF threads on the first page of this forum (and dozens more on the pages after that), almost every one of which is due do overwatering, so don't feel like you're the first person to have the issue. I almost feel like starting a thread aimed at new FLF owners!

Anyhow, the goal is to control soil moisture so the roots don't die from drought or suffocate from lack of oxygen in saturated soils. I'll bet the soil in that pot is very fine, peaty, water retentive potting soil that stays saturated in the bottom half of the pot long after the top inch or two is bone dry. The good news is that there's an easy, quick and reliable way to check soil moisture and prevent any more drowned roots.

Here's a thread about caring for sick plants that will explain what's going on, and here's an excerpt from a post by tapla (Al) specifically about when and how to water. Try his method and your plant will love it. And don't hesitate to ask more questions!

"You can tell you've watered too much (or too little - the response is the same - a drought response) when leaves start to turn yellow or you begin to see nutritional deficiencies created by poor root metabolism (usually N and Ca are first evident). You can prevent overwatering by A) testing the soil deep in the container with a wood dowel ... wet & cool - do not water, dry - water. B) feeling the wick & only watering when it's dry C) feel the soil at the drain hole & only water when it feels dry there.

Soils feel dry to our touch when they still have 40-45% moisture content. Plants, however, can still extract water from soils until they dry down to about 25-30%, so there is still around a 15% cush in that plants can still absorb considerable moisture after soils first feel dry to us.

Water slowly until the soil is saturated but no water (or very little water) has exited the pot drain. Wait 10-15 minutes and water again so at least 15-20% of the volume of water used ion both applications flushes out the accumulating salts. After the pot stops draining, you can return it to its normal spot and arrangmt. Wait until time to water again & repeat the routine."

Beautiful big tree! If you sat my one on top of the soil in your pot I don't think it would even reach your bottom leaves!

Lots of excellent advice on this forum, settle in for a bit of a read and enjoy :)

Thanks so much for the advice littlebuggy, I'm going to do some more reading.

Ive put some wooden stakes in the soil to track the watering better, but I think you're right, I might have watered to soon, as the browning started shortly after.

It was in the shop along a back wall with no direct sun for about 1 mo before I bought it. Do you think a south facing window with direct sun is too much light? Should I keep the blinds closed?

Hey LittleBuggy - this is still too soon to water, correct?

The real test is how the wood feels, but given how stained it is I'll bet the stick feels damp and is cool if you hold it to the back of your hand or your cheek. Has it been dry enough to water yet?