When you say "purchaser of a company", what exactly do you mean? If we are talking about a corporation, which is a separate legal entity, and the purchaser just bought the stock of the corporation, then the corporation, now owned by the purchaser, is still obligated under the contract to let you use the conference room (I"m assuming the contract is valid and can't legally be cancelled.) If, however, the purchaser merely bought some of the assets, rather than the stock, of the seller, it would usually (except for unusual circumstances) only be obligated on those contracts which it agreed to assume, and it may well not have assumed the obligation to let you use the conference room.
I assume that this conference room is in an office which the seller either rented or owned, and that (if it was an asset sale and not a stock sale) the purchaser bought the lease or the building, whichever is applicable. Your right to use the conference room was a restriction on the seller's ownership of the lease or building, just as a power company's right to string lines over real property is a restriction on the owner's rights, and passes along with any sale of the land. However, while you have the right to sue the seller for any damages you suffer from the breach, the purchaser would only have to honor the agreement if it had notice of it before the sale (i.e. if the seller told the purchaser about the agreement, or if the agreement had been publicly recorded as a restriction on title to the lease, or building, as the case may be.) If it was an asset sale, and if the purchaser had no reason to know that you had any right to use the conference room when it bought the business, it doesn't have to let you use the room, but you can sue the seller for your damages....
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