[White House budget stuff]
The White House is one of the various Titles of the Financial Services & General Government yearly appropriations bill; skip to page 129 of
this pdf for the FY2020 appropriations levels. Or, for chart form, page 667 of
this pdf (rotate 90 degree clockwise, too).
Looks like about $14 million for residence expenses (that includes $750k for restoration), $55 million for "salaries and expenses" (I'm assuming this is more for executive office staff and not e.g. scullery maids), and another $4.5 million for the VP's residence. And much more for official offices linked to the Executive Office like the Office of Management and Budget (the most important agency you've never heard of).
Considering that it perfectly matches the formal budget request, should be safe to go
here for more details if you really want to see a breakdown of what the White House wants to spend it on. Start on page 19, I guess, though there isn't too much to see.
Anyhoo, that's a decent amount of money appropriated from taxpayer funds - a lot more than $50k - though I couldn't say if it's sufficient.
Edit: Note that the Secret Service is funded from a separate bill (though same two pdfs as above thanks to omnibuses), to the tune of about $2.4 billion. I
think that the milking of government funds that Trump has been doing is mainly from their funding? Honestly not sure, though.